Hayes H08-15355F Reference Manual

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Doc. No. 1118, Rev. 2
February 5, 1999

Command Reference Manual

Information provided by Conexant Sys t ems, Inc. is believed to be accurate and reliable. However, no responsibility is assumed by Conexant
for its use, nor any inf ri ngem ent of patents or other rights of third parties which may resul t from its use. No license is granted by implicat i on or
otherwise under any patent rights of Conexant other than for circui t ry embodied in Conexant products. Conexant reserves the right to change
circuitry at any t i m e wi thout notice. This document is subject to change without notice.

K56flex is a trademark of Conexant Systems, I nc. and Lucent Technologies.
Conexant and “What's Next in Comm uni cations Technologies” are trademarks of Conexant Systems, Inc.

Product names or servic es listed in this publication are for identificat i on purposes only, and may be trademark s or registered trademarks of
their respective com pani es. All other marks ment i oned herei n are the property of their respecti ve owners.

©1999, Conexant Systems, Inc.
Printed in U.S.A.
All Rights Reserved

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Table of Contents

1. INTRODUCTION............................................................................................................................................................... 1-1

1.1 OVERVIEW ............................................................................................................................................................1-1

1.1.1 Command Syntax..................................................................................................................................... 1-1

1.1.2 Command Descriptions............................................................................................................................ 1-1

1.2 REFERENCE DOCUMENTATION..................................................................................................... .................... 1-1

2. SYNTAX AND PROCEDURES......................................................................................................................................... 2-1

2.1 Alphabet ................................................................................................................................................................. 2-1

2.2 DTE Commands Lines............................................................................................................................................ 2-1

2.2.1 Command Line General Format............................................................................................................... 2-1

2.2.2 Command Line Editing............................................................................................................................. 2-1

2.2.3 Command Line Echo................................................................................................................................ 2-1

2.2.4 Repeating a Command Line..................................................................................................................... 2-2

2.2.5 Types of DTE Commands........................................................................................................................ 2-2

2.3 Basic Syntax Commands........................................................................................................................................ 2-2

2.3.1 Basic Syntax Command Format............................................................................................................... 2-2

2.3.2 S-Parameters........................................................................................................................................... 2-2

2.4 Extended Syntax Commands................................................................................................................................. 2-3

2.4.1 Command Naming Rules......................................................................................................................... 2-3

2.4.2 Values ...................................................................................................................................................... 2-3

2.4.2.1 Numeric Constants................................................................................................................... 2-3

2.4.2.2 String Constants....................................................................................................................... 2-3

2.4.2.3 Compound Values.................................................................................................................... 2-4

2.4.3 Action Commands.................................................................................................................................... 2-4

2.4.3.1 Action Execution Command Syntax......................................................................................... 2-4

2.4.3.2 Action Test Command Syntax.................................................................................................. 2-4

2.4.4 Parameter Commands............................................................................................................................. 2-4

2.4.4.1 Parameter Types...................................................................................................................... 2-4

2.4.4.2 Parameter Set Command Syntax.............................................................................................2-5

2.4.4.3 Parameter Read Command Syntax ......................................................................................... 2-5

2.4.4.4 Parameter Test Command Syntax........................................................................................... 2-5

2.4.5 Additional Syntax Rules ........................................................................................................................... 2-5

2.4.5.1 Concatenating Commands after Extended Syntax Commands............................................... 2-5

2.4.5.2 Concatenating Commands after Basic Format Commands..................................................... 2-5

2.5 Issuing Commands................................................................................................................................................. 2-6

2.6 Executing Commands............................................................................................................................................. 2-6

2.6.1 Aborting Commands................................................................................................................................. 2-6

2.6.2 Handling of Invalid Numbers and S-Parameter Values............................................................................ 2-6

2.7 Modem Responses................................................................................................................................................. 2-6

2.7.1 Responses ............................................................................................................................................... 2-7

2.7.2 Extended Syntax Result Codes................................................................................................................ 2-7

2.7.3 +<name>: <compound_value>Information Text Formats for Test Commands........................................ 2-8

2.7.3.1 Range of Values....................................................................................................................... 2-8

2.7.3.2 Compound Range of Values.................................................................................................... 2-8

3. DATA COMMAND SET..................................................................................................................................................... 3-1

3.1 COMMAND GUIDELINES...................................................................................................................................... 3-1

3.1.1 Escape Code Sequence........................................................................................................................... 3-1

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3.2 DATA COMMANDS................................................................................................................................................ 3-1

3.2.1 Generic Modem Control........................................................................................................................... 3-1

3.2.1.1 Z - Reset to Default Configuration............................................................................................ 3-1

3.2.1.2 +FCLASS - Select Active Service Class .................................................................................. 3-2

3.2.1.3 +VCID - Caller ID (CID)............................................................................................................ 3-2

3.2.1.4 \N - Operating Mode................................................................................................................. 3-3

3.2.1.5 &F - Set to Factory-Defined Configuration............................................................................... 3-3

3.2.1.6 &T - Local Analog Loopback Test............................................................................................ 3-4

3.2.1.7 I - Request Identification Information ....................................................................................... 3-4

3.2.1.8 +GMI - Request Manufacturer Identification ............................................................................ 3-5

3.2.1.9 +GMM - Request Model Identification ......................................................................................3-5

3.2.1.10 +GMR - Request Revision Identification..................................................................................3-5

3.2.1.11 +GSN - Request Product Serial Number Identification ............................................................ 3-6

3.2.1.12 +GOI - Request Global Object Identification............................................................................ 3-6

3.2.1.13 +GCAP - Request Complete Capabilities List .......................................................................... 3-6

3.2.1.14 +GCI - Country of Installation ................................................................................................... 3-7

3.2.2 DTE-Modem interface commands............................................................................................................ 3-7

3.2.2.1 E - Command Echo.................................................................................................................. 3-7

3.2.2.2 Q - Quiet Results Codes Control.............................................................................................. 3-8

3.2.2.3 V - Result Code Form............................................................................................................... 3-8

3.2.2.4 W - Connect Message Control................................................................................................. 3-8

3.2.2.5 X - Extended Result Codes...................................................................................................... 3-9

3.2.2.6 &C - RLSD Behavior .............................................................................................................. 3-13

3.2.2.7 &D - DTR Behavior................................................................................................................. 3-13

3.2.2.8 &K - Flow Control................................................................................................................... 3-14

3.2.2.9 &M - Asynchronous/Synchronous Mode Selection................................................................ 3-14

3.2.2.10 &Q - Sync/Async Mode.......................................................................................................... 3-14

3.2.2.11 +IPR - Fixed DTE Rate .......................................................................................................... 3-15

3.2.2.12 +IFC - DTE-Modem Local Flow Control................................................................................. 3-16

3.2.2.13 +ILRR - DTE-Modem Local Rate Reporting........................................................................... 3-16

3.2.3 Call Control............................................................................................................................................. 3-17

3.2.3.1 D - Dial ................................................................................................................................... 3-17

3.2.3.2 T - Set Tone Dial Default........................................................................................................ 3-18

3.2.3.3 P - Set Pulse Dial Default....................................................................................................... 3-19

3.2.3.4 A - Answer.............................................................................................................................. 3-19

3.2.3.5 H - Disconnect (Hang-Up)...................................................................................................... 3-19

3.2.3.6 O - Return to On-Line Data Mode..........................................................................................3-20

3.2.3.7 L - Speaker Volume................................................................................................................ 3-20

3.2.3.8 M - Speaker Control............................................................................................................... 3-21

3.2.3.9 &G - Select Guard Tone......................................................................................................... 3-21

3.2.3.10 &P - Select Pulse Dial Make/Break Ratio............................................................................... 3-22

3.2.3.11 &V - Display Current Configuration and Stored Profile .......................................................... 3-22

3.2.3.12 &W - Store Current Configuration .......................................................................................... 3-23

3.2.3.13 *B - Display Blacklisted Numbers........................................................................................... 3-23

3.2.3.14 *D - Display Delayed Numbers............................................................................................... 3-23

3.2.4 Modulation Control Commands.............................................................................................................. 3-24

3.2.4.1 +MS - Modulation Selection................................................................................................... 3-24

3.2.4.2 +MR - Modulation Reporting Control...................................................................................... 3-25

3.2.4.3 %E - Enable/Disable Line Quality Monitor, Auto-Retrain, and Auto-Rate Renegotiation....... 3-26

3.2.5 Error Control Commands........................................................................................................................ 3-27

3.2.5.1 +ES - Error Control and Synchronous Mode Selection.......................................................... 3-27

3.2.5.2 +EB - Break Handling in Error Control Operation................................................................... 3-28

3.2.5.3 +ESR - Selective Repeat .......................................................................................................3-29

3.2.5.4 +EFCS - 32-bit Frame Check Sequence................................................................................ 3-29

3.2.5.5 +ER - Error Control Reporting................................................................................................ 3-29

3.2.5.6 +ETBM - Call Termination Buffer Management ..................................................................... 3-30

3.2.6 Data Compression Commands.............................................................................................................. 3-31

3.2.6.1 +DS - Data Compression....................................................................................................... 3-31

3.2.6.2 +DR - Data Compression Reporting....................................................................................... 3-31

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3.2.6.3 %C - Enable/Disable Data Compression ............................................................................... 3-32

3.2.6.4 N - Automode Enable............................................................................................................. 3-33

3.2.7 V.8/V.8bis Commands............................................................................................................................ 3-33

3.2.7.1 +A8E - V.8 and V.8bis Operation Controls............................................................................. 3-33

3.2.7.2 +A8M - Send V.8 Menu Signals.............................................................................................3-34

3.2.7.3 +A8I: - CI Signal Indication..................................................................................................... 3-34

3.2.7.4 +A8C: - Calling Tone Indication ............................................................................................. 3-35

3.2.7.5 +A8A: - Answer Signal Indication........................................................................................... 3-35

3.2.7.6 +A8J: - V.8 Negotiation Complete.......................................................................................... 3-36

3.2.7.7 +A8M: - V.8 Menu Report....................................................................................................... 3-36

3.2.7.8 +A8R: - V.8bis Signal and Message Reporting...................................................................... 3-36

3.2.8 Synchronous Access Mode Commands ................................................................................................ 3-39

3.2.8.1 +ESA - Configure Synchronous Access Mode....................................................................... 3-39

3.2.8.2 +ITF - Transmit Flow Control Thresholds............................................................................... 3-40

3.2.9 Diagnostic and Test Commands............................................................................................................ 3-41

3.2.9.1 #UD –

3.2.9.2 %TT - PTT Test Command.................................................................................................... 3-48

3.3 S-PARAMETERS ................................................................................................................................................. 3-51

3.3.1.1 AT=x - Write to Selected S-Parameter................................................................................... 3-51

3.3.1.2 AT? - Read Selected S-Parameter......................................................................................... 3-51

3.3.1.3 Sn - Read/Write S-Parameter ................................................................................................ 3-52

3.3.2 Factory Defaults..................................................................................................................................... 3-52

3.3.3 S-Parameter Definitions......................................................................................................................... 3-52

3.3.3.1 S0 - Number of Rings to Automatic Answer........................................................................... 3-52

3.3.3.2 S1 - Ring Counter................................................................................................................... 3-52

3.3.3.3 S2 - Escape Character........................................................................................................... 3-52

3.3.3.4 S3 - Line Termination Character............................................................................................3-53

3.3.3.5 S4 - Response Formatting Character..................................................................................... 3-53

3.3.3.6 S5 - Command Line Editing Character................................................................................... 3-53

3.3.3.7 S6 - Wait Time for Dial Tone Before Blind Dialing, or After “W” Dial Modifier........................ 3-53

3.3.3.8 S7 - Wait Time For Carrier After Dial, For Silence, or For Dial Tone After “W” Dial Modifier. 3-54

3.3.3.9 S8 - Pause Time For Dial Delay............................................................................................. 3-54

3.3.3.10 S10 - Lost Carrier To Hang Up Delay .................................................................................... 3-54

3.3.3.11 S11 - DTMF Tone Duration.................................................................................................... 3-54

3.3.3.12 S12 - Escape Prompt Delay (EPD)........................................................................................ 3-54

3.3.3.13 S18 - Test Timer..................................................................................................................... 3-55

3.3.3.14 S29 - Flash Dial Modifier Time............................................................................................... 3-55

3.3.3.15 S30 - Disconnect Inactivity Timer........................................................................................... 3-55

3.3.3.16 S46 - Data Compression Control ........................................................................................... 3-55

3.3.3.17 S95 - Extended Result Codes Control ................................................................................... 3-55

3.4 CELLULAR COMMANDS..................................................................................................................................... 3-56

3.4.1.1 +WS - Enable/Disable PDC ................................................................................................... 3-56

3.4.1.2 PDC High-Speed Data Communication Mode Commands.................................................... 3-56

3.5 RESULT CODES.................................................................................................................................................. 3-57

4. FAX CLASS 1 AND FAX CLASS 1.0 COMMANDS......................................................................................................... 4-1

4.1 FAX I/O PROCESSING.......................................................................................................... ................................ 4-1

4.1.1 DTE-to-Modem Transmit Data Stream..................................................................................................... 4-1

4.1.2 Modem-to-DTE Receive Data Stream...................................................................................................... 4-1

4.1.3 Fax Mode Selection.................................................................................................................................. 4-1

4.1.4 Fax Origination......................................................................................................................................... 4-2

4.1.5 Fax Answering.......................................................................................................................................... 4-2

4.1.6 Fax Control Transmission ........................................................................................................................ 4-2

4.1.7 Fax Control Reception.............................................................................................................................. 4-2

4.1.8 Fax Data Transmission ............................................................................................................................ 4-3

4.1.9 Fax Data Reception.................................................................................................................................. 4-3

Last Call Status Report............................................................................................... 3-41

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4.2 COMMANDS AND PARAMETERS........................................................................................................................ 4-4

4.2.1 Mode Entry Commands............................................................................................................................ 4-4

4.2.1.1 +FCLASS=1 - Select Facsimile Class 1 Mode......................................................................... 4-4

4.2.1.2 +FCLASS=1.0 - Select Facsimile Class 1.0 Mode................................................................... 4-4

4.2.2 Mode Commands..................................................................................................................................... 4-4

4.2.2.1 +FAE - Auto Answer Enable .................................................................................................... 4-4

4.2.2.2 +FTS - Transmit Silence .......................................................................................................... 4-4

4.2.2.3 +FRS - Receive Silence........................................................................................................... 4-5

4.2.2.4 +FTM - Transmit Facsimile ...................................................................................................... 4-5

4.2.2.5 +FRM - Receive Facsimile....................................................................................................... 4-6

4.2.2.6 +FTH - Transmit Data with HDLC Framing.............................................................................. 4-7

4.2.2.7 +FRH - Receive Data with HDLC Framing ............................................................................... 4-7

4.2.3 Service Class 1 Parameters ..................................................................................................................... 4-8

4.2.3.1 +FAR - Adaptive Reception Control......................................................................................... 4-8

4.2.3.2 +FCL - Carrier Loss Timeout.................................................................................................... 4-9

4.2.3.3 +

4.2.3.4 +

4.2.3.5 +FPR - Fixed DTE Rate ......................................................................................................... 4-11

4.2.3.6 +FMI - Request Manufacturer Identification........................................................................... 4-11

4.2.3.7 +FMM - Request Model Identification .................................................................................... 4-12

4.2.3.8 +FMR - Request Revision Identification................................................................................. 4-12

4.2.3.9 +FLO - Flow Control............................................................................................................... 4-12

4.3 EXAMPLES .......................................................................................................................................................... 4-12

5. VOICE COMMANDS......................................................................................................................................................... 5-1

5.1 Voice Commands Overview ................................................................................................................................... 5-1

5.1.1 <DLE> Shielded Event Codes Sent to the DTE....................................................................................... 5-2

5.1.2 <DLE> Shielded Codes Sent to the Modem (DCE).................................................................................. 5-3

5.2 Voice Commands................................................................................................................................................... 5-4

5.2.1 Configuration Commands......................................................................................................................... 5-4

5.2.1.1 +FCLASS=8 - Select Voice Mode............................................................................................5-4

5.2.1.2 +FCLASS=80 - Select VoiceView Mode.................................................................................. 5-4

5.2.1.3 +VNH - Automatic Hang-up Control.........................................................................................5-4

5.2.2 Voice Commands..................................................................................................................................... 5-5

5.2.2.1 +VIP - Voice Initialize All Parameters....................................................................................... 5-5

5.2.2.2 +VRX - Start Modem Receive (Record)................................................................................... 5-5

5.2.2.3 +VTR - Start Voice Transmission and Reception (Voice Duplex)............................................ 5-5

5.2.2.4 +VTS - Send Voice Tone(s)..................................................................................................... 5-6

5.2.2.5 +VTX - Start Modem Transmit (Playback)................................................................................ 5-8

5.2.2.6 +VGR - Voice Gain Receive (Record Gain)............................................................................. 5-8

5.2.2.7 +VGT - Voice Gain Transmit (Playback Volume)..................................................................... 5-8

5.2.2.8 +VIT - Voice Inactivity Timer (DTE/Modem)............................................................................. 5-9

5.2.2.9 +VLS - Analog Source/Destination Selection......................................................................... 5-10

5.2.2.10 +VRA - Ringback Goes Away Timer...................................................................................... 5-12

5.2.2.11 +VRN - Ringback Never Appeared Timer.............................................................................. 5-12

5.2.2.12 +VSD - Silence Detection (Quiet and Silence)....................................................................... 5-13

5.2.2.13 +VSM - Compression Method Selection................................................................................ 5-14

5.2.2.14 +VTD - Beep Tone Duration Timer.........................................................................................5-15

5.2.2.15 +VDR - Distinctive Ring.......................................................................................................... 5-16

5.2.2.16 +VDT - Control Tone Cadence Reporting.............................................................................. 5-17

5.2.2.17 +VBT - Buffer Threshold Setting............................................................................................ 5-18

5.2.2.18 +VPR - Select DTE/Modem Interface Rate (Turn Off Autobaud)........................................... 5-19

5.2.3 Speakerphone Commands..................................................................................................................... 5-20

5.2.3.1 +VSP - Speakerphone ON/OFF............................................................................................. 5-20

5.2.3.2 +VDX - Speakerphone Duplex Mode..................................................................................... 5-20

5.2.3.3 +VGM - Microphone Gain....................................................................................................... 5-21

5.2.3.4 +VGS - Speaker Gain ............................................................................................................ 5-21

6. INDEX ............................................................................................................................................................................... 6-1

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FDD - Double Escape Character Replacement ..................................................................... 4-9

FIT - DTE Inactivity Timeout................................................................................................. 4-10

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List of Tables

Table 3-1. Result Codes......................................................................................................................................................... 3-10

Table 3-1. +MS Command Supported Rates ......................................................................................................................... 3-24

Table 3-2. V.8/V.8bis Example Commands/Responses for Originator and Answerer............................................................3-37

Table 3-3. AT#UD Last Call Status Report Format................................................................................................................ 3-43

Table 3-4. Call Setup Result Codes....................................................................................................................................... 3-44

Table 3-5. Multimedia Modes................................................................................................................................................. 3-44

Table 3-6. DTE-DCE modes................................................................................................................................................... 3-44

Table 3-7. V.34 INFO bit report.............................................................................................................................................. 3-44

Table 3-8. gstnModulationSchemeActive from 3.7.2/V.58 ..................................................................................................... 3-45

Table 3-9. errorControl Active from 3.5.2/V.58....................................................................................................................... 3-45

Table 3-10. compressionActive from 3.2.2/V.58..................................................................................................................... 3-45

Table 3-11. callCleared codes from 3.6.4/V.58-1994............................................................................................................. 3-46

Table 3-12. Completed Data Call, with some errors and rate retrain during the call.............................................................. 3-47

Table 3-13. S-Parameter Summary........................................................................................................................................ 3-51

Table 3-14. Result Code Definitions....................................................................................................................................... 3-58

Table 4-1. Fax Class 1 and Fax Class 1.0 Commands............................................................................................................ 4-1

Table 4-2. Fax Class 1 and Fax Class 1.0 Modulation Modes and Rates................................................................................ 4-5

Table 4-3. Inactivity Timer Start and Stop Events.................................................................................................................. 4-10

Table 4-4. Fax Class 1 Calling Sequence (Transmitting a Single Page)................................................................................ 4-13

Table 4-5. Fax Class 1 Answering Sequence (Receiving a Single Page).............................................................................. 4-14

Table 5-1. Voice Commands.................................................................................................................................................... 5-1

Table 5-2. Supported <DLE> Shielded Codes Sent to the DTE............................................................................................... 5-2

Table 5-3. Supported <DLE> Shielded Codes Sent to the Modem (DCE)............................................................................... 5-3

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1. INTRODUCTION

1.1 OVERVIEW

This manual describes the host command and responses for Conexant host-controlled and host-processed (SoftK56)
modem families. These families include the following (but are not limited to) modem products:

RCV56HCF-ISA Modem Device Set
RCV56HCF-PCI Modem Device Set
RH56D-PCI/RC56HCF-PCI Modem Device Set
RH56LD-PCI Modem Device Set
SoftK56-PCI (RS56-PCI) for PCI Bus Modem Device Set
RH56D-PCI Modem Device Set
RMH56D/RMS56 Modem Device Set

The descriptions in this manual apply to all commands and parameters that may be supported by different modem models.
Refer to Modem Software Release notes for commands applicable to specific modem models.

The commands and responses are implemented in host software for specific modem models. Additional configuration and
implementation information is available in release notes and/or readme files that accompany product software release. The
.INF File contains exact application unique information and default values.

This document supersedes Commands for SoftK56 Modems Reference Manual (Order No. 1163, Rev. 2, April 30, 1998) and
Commands for RH56D/RC56HCF and RH56LD Modems (Order No. 1118, Rev. 1, September 9, 1998).

1.1.1 Command Syntax

The fundamental DTE interface command syntax is described in Section 2.

1.1.2 Command Descriptions

These commands are grouped into the following categories:

Syntax and procedures Section 2
Data commands Section 3
Fax Class 1 and Fax Class 1.0 commands Section 5
Voice/Audio commands Section 5

1.2 REFERENCE DOCUMENTATION

RC56HCF-ISA Modem Device Set Designer’s Guide (Order No. 1123)
RC56HCF-PCI Modem Device Set Designer’s Guide (Order No. 1129)
RC56D-PCI Host Controlled V.90/K56flex Modem Device Family for Desktop Applications Designer’s Guide (Order No.

1174)
SoftK56-PCI Modem Device Set Designer's Guide (Order No. 1160)
SoftK56-PCI Host-Software Processed V.90/K56flex Modem Device Family for Desktop Applications Designer's Guide

(Order No. 1201)
RH56LD-PCI Host-Controlled V.90/K56flex Modem Device Family for Mobile Applications (Order No. 1164)
RS56L-PCI Host-Processed V.90/K56flex Modem Device Family for Mobile Applications (Order No. 1202)
RMH56LD/RMS56LD Host-Controlled/Processed V.90/K56flex Modem Device Family for Mobile Applications (Order No.

1203)

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2. SYNTAX AND PROCEDURES

The command and response syntax and procedures generally conform to referenced recommendations and standards. Since
these recommendations and standards describe characteristics universal to a large installed base of modems to a maximum
degree, there may be syntax and procedural differences due to extensions and behavioral differences in implemented
commands, parameters, and responses beyond that described in these recommendations and standards.

The syntax and procedures described in this section are based on V.250 and V.253 with additional information included for
implemented extensions, behavioral differences beyond V.250, and legacy commands.

2.1 Alphabet

The T.50 International Alphabet 5 (IA5) is used in this document. Only the low-order seven bits of each character are
significant to the modem; any eighth or higher-order bit(s), if present, are ignored for the purpose of identifying commands
and parameters. Lower-case characters are considered identical to their upper-case equivalents when received by the
modem from the DTE. Result codes from the modem are in upper case.

2.2 DTE Commands Lines

Words enclosed in <angle brackets> are references to syntactical elements. The brackets are not used when the words
appear in a command line, the brackets are not used. Words enclosed in [square brackets] represent optional items which
may be omitted from the command line at the specified point. The square brackets are not used when the words appear in the
command line. Other characters that appear in syntax descriptions must as included as shown.

Any modem responses are mentioned in terms of their alphabetic format; the actual response issued will depend on the
setting of parameters that affect response formats, e.g., Q and V commands (see 2.7).

2.2.1 Command Line General Format

A command line is made up of three elements: the prefix, the body, and the termination character.
The command line prefix consists of the characters "AT" or "at" or, to repeat the execution of the previous command line, the

characters "A/" or "a/".
The body is made up of individual commands described in this document. Space characters (IA5 2/0) are ignored and may be

used freely for formatting purposes, unless they are embedded in numeric or string constants. The termination character may
not appear in the body. The modem can accept at least 40 characters in the body.

The termination character may be selected by a user option (parameter S3), the default being CR.

2.2.2 Command Line Editing

The character defined by parameter S5 (default, BS) is interpreted as a request from the DTE to the modem to delete the
previous character. Any control characters (IA5 0/0 through 1/15, inclusive) that remain in the command line after receipt of
the termination character are ignored by the modem.

The modem checks characters from the DTE first to see if they match the termination character (S3), then the editing
character (S5), before checking for other characters. This ensures that these characters will be properly recognized even if
they are set to values that the modem uses for other purposes. If S3 and S5 are set to the same value, a matching character
will be treated as matching S3 (S3 is checked before S5).

2.2.3 Command Line Echo

The modem may echo characters received from the DTE during command state and online command state back to the DTE,
depending on the setting of the E command. If enabled, characters received from the DTE are echoed in the same format as
received. Invalid characters in the command line or incomplete or improperly-formed command line prefixes may not be
echoed.

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2.2.4 Repeating a Command Line

If the prefix "A/" or "a/" is received, the modem immediately executes once again the body of the preceding command line. No
editing is possible, and no termination character is necessary. A command line may be repeated multiple times in this
manner. Responses to the repeated command line are issued using format of the original command line. If "A/" is received
before any command line has been executed, the preceding command line is assumed to have been empty (that results in an
OK result code).

2.2.5 Types of DTE Commands

There are two types of commands: action commands and parameter commands. Commands of either type may be included
in command lines, in any order.

Action commands may be "executed" (to invoke a particular function of the equipment, which generally involves more than
the simple storage of a value for later use), or "tested" (to determine whether or not the equipment implements the action
command, and, if subparameters are associated with the action, the ranges of subparameter values that are supported).

Parameters may be "set" (to store a value or values for later use), "read" (to determine the current value or values stored), or
"tested" (to determine whether or not the equipment implements the parameter, and the ranges of values supported).

2.3 Basic Syntax Commands

2.3.1 Basic Syntax Command Format

The format of Basic Syntax commands, except for the D and S commands, is as follows:

<command>[<number>]

where <command> is either a single character, or the "&" character followed by a single character per V.250. In addition,
<command> can be the "%" character followed by a single character, the "*" character followed by a single character, or the
"^" character followed by a single character.

<number> may be a string of one or more characters from "0" through "9" representing a decimal integer value. Commands
that expect a <number> are noted in the description of the command. If a command expects <number> and it is missing
(<command> is immediately followed in the command line by another <command> or the termination character), the value "0"
is assumed. If a command does not expect a <number> and a number is present, an ERROR is generated. All leading "0"s in
<number> are ignored by the modem.

Additional commands may follow a command (and associated parameter, if any) on the same command line without any
character required for separation. The actions of some commands cause the remainder of the command line to be ignored
(e.g., A).

See the D command for details on the format of the information that follows it.

2.3.2 S-Parameters

Commands that begin with the letter "S" are known as "S-parameters". The number following the "S" indicates the "parameter
number" being referenced. If the number is not recognized as a valid parameter number, an ERROR result code is issued.

Immediately following this number, either a "?" or "=" character must appear. "?" is used to read the current value of the
indicated S-parameter; "=" is used to set the S-parameter to a new value.

S<parameter_number>?
S<parameter_number>=[<value>]

If the "=" is used, the new value to be stored in the S-parameter is specified in decimal following the "=". If no value is given
(i.e., the end of the command line occurs or the next command follows immediately), the S-parameter specified may be set to
0, or an ERROR result code issued and the stored value left unchanged. The ranges of acceptable values are given in the
description of each S-parameter.

If the "?" is used, the modem transmits a single line of information text to the DTE. The text portion of this information text
consists of exactly three characters, giving the value of the S-parameter in decimal, with leading zeroes included.

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2.4 Extended Syntax Commands

2.4.1 Command Naming Rules

Both actions and parameters have names, which are used in the related commands. Names always begin with the character
"+". Following the "+", from one to 16 additional characters appear in the command name. These characters will be selected
from the following set:

A through Z (IA5 4/1 through 5/10)
0 through 9 (IA5 3/0 through 3/9)
! (IA5 2/1)
% (IA5 2/5)

- (IA5 2/13)
. (IA5 2/14)
/ (IA5 2/15)
: (IA5 3/10)
_ (IA5 5/15)

The first character following the "+" must be an alphabetic character in the range of "A" through "Z". This first character
generally implies the application in which a command is used (e.g., F for Fax or V for voice).

The modem considers lower-case characters to be the same as their upper-case equivalents.

2.4.2 Values

When subparameters are associated with the execution of an action, or when setting a parameter, the command may include
specification of values. This is indicated by the appearance of <value> in the descriptions below.

<value> consists of either a numeric constant or a string constant.

2.4.2.1 Numeric Constants

Numeric constants are expressed in decimal, hexadecimal, or binary.
Decimal numeric constants consist of a sequence of one or more of the characters "0" through "9", inclusive.
Hexadecimal numeric constants consist of a sequence of one or more of the characters "0" through "9", inclusive, and "A"

through "F" inclusive. The characters "A" through "F" represent the equivalent decimal values 10 through 15.
Binary numeric constants consist of a sequence of one or more of the characters "0" and "1".
In all numeric constants, the most significant digit is specified first. Leading "0" characters are ignored by the modem. No

spaces, hyphens, periods, commas, parentheses, or other generally-accepted numeric formatting characters are permitted in
numeric constants; note in particular that no "H" suffix is appended to the end of hexadecimal constants.

2.4.2.2 String Constants

String constants consist of a sequence of displayable IA5 characters, each in the range from 2/0 to 7/15, inclusive, except for
the characters ‘"’ (IA5 2/2) and "\" (IA5 5/12). String constants are bounded at the beginning and end by the double-quote
character (‘"’, IA5 2/2).

Any character value may be included in the string by representing it as a backslash ("\") character followed by two
hexadecimal digits. For example, "\0D" is a string consisting of the single character <CR> (IA5 0/13). If the "\" character itself
is to be represented in a string, it is encoded as "\5C". The double-quote character, used as the beginning and ending string
delimiter, is represented within a string constant as "\22".

A "null" string constant, or a string constant of zero length, is represented by two adjacent delimiters ("").

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2.4.2.3 Compound Values

Actions may have more than one subparameter associated with them, and parameters may have more than one value. These
are known as "compound values", and their treatment is the same in both actions and parameters.

A compound value consists of any combination of numeric and string values (as defined in the description of the action or
parameter). The comma character must be included as a separator, before the second and all subsequent values in the
compound value. If a value is not specified (i.e., defaults assumed), the required comma separator must be specified;
however, trailing comma characters may be omitted if all associated values are also omitted.

2.4.3 Action Commands

2.4.3.1 Action Execution Command Syntax

There are two general types of action commands: those that have associated subparameter values that affect only that
invocation of the command, and those that have no subparameters.

If subparameters are associated with a command, the definition of the action command indicates, for each subparameter,
whether the specification of a value for that subparameter is mandatory or optional. For optional subparameters, the definition
indicates the assumed (default) value for the subparameter if no value is specified for that subparameter; the assumed value
may be either a previous value (i.e., the value of an omitted subparameter remains the same as the previous invocation of the
same command, or is determined by a separate parameter or other mechanism), or a fixed value (e.g., the value of an
omitted subparameter is assumed to be zero). Generally, the default value for numeric subparameters is 0, and the default
value for string subparameters is "" (empty string).

The following syntax is used for actions that have no subparameters:

+<name>

The following syntax is used for actions that have one subparameter:

+<name>[=<value>]

The following syntax is used for actions that have two or more subparameters:

+<name>[=<compound_value>]

For actions that accept subparameters, if all subparameters are defined as being optional, and the default values for all
subparameters are satisfactory, the data terminal equipment (DTE) may use the first syntax above (i.e., omit the "=" from the
action execution command as well as all of the subparameter value string).

If all other relevant criteria are met (e.g., the modem is in the proper state), the command is executed with any indicated
subparameters. If <name> is not recognized, the modem issues the ERROR result code and terminates processing of the
command line. An ERROR is also generated if a subparameter is specified for an action that does not accept subparameters,
if too many subparameters are specified, if a mandatory subparameter is not specified, if a value is specified of the wrong
type, or if a value is specified that is not within the supported range.

2.4.3.2 Action Test Command Syntax

The DTE may test if an action command is implemented in the modem by using the syntax:

+<name>=?

If the modem does not recognize the indicated name, it returns an ERROR result code and terminates processing of the
command line. If the modem does recognize the action name, it returns an OK result code. If the named action accepts one
or more subparameters, the modem sends an information text response to the DTE, prior to the OK result code, specifying
the values supported by the modem for each such subparameter, and possibly additional information. The format of this
information text is defined for each action command.

2.4.4 Parameter Commands

2.4.4.1 Parameter Types

Parameters may be defined as "read-only" or "read-write". "Read-only" parameters are used to provide status or identifying
information to the DTE, but cannot be set by the DTE; attempting to set their value is an error. In some cases (specified in the
description of the individual parameter), the modem may ignore attempts to set the value of such parameters rather than

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respond with an ERROR result code, if the continued correct operation of the interface between the modem and DTE will not
be affected by such action. Read-only parameters may be read and tested.

"Read-write" parameters may be set by the DTE, to store a value or values for later use. Read-write parameters may be set,
read, and tested.

Parameters may take either a single value, or multiple (compound) values. Each value may be either numeric or string; the
definition of the parameter will specify the type of value for each subparameter. Attempting to store a string value in a numeric
parameter, or a numeric value in a string parameter, is an error.

2.4.4.2 Parameter Set Command Syntax

The definition of the parameter indicates, for each value, whether the specification of that value is mandatory or optional. For
optional values, the definition indicates the assumed (default) value if none is specified; the assumed value may be either a
previous value (i.e., the value of an omitted subparameter retains its previous value), or a fixed value (e.g., the value of an
omitted subparameter is assumed to be zero). Generally, the default value for numeric parameters is 0, and the default value
for string parameters is "" (empty string).

The following syntax is used for parameters that accept a single value:

+<name>=[<value>]

The following syntax is used for parameters that accept more than one value:

+<name>=[<compound_value>]

For each implemented parameter, if all mandatory values are specified, and all values are valid according to the definition of
the parameter, the specified values are stored. If <name> is not recognized, one or more mandatory values are omitted, or
one or more values are of the wrong type or outside the permitted range, the modem issues the ERROR result code and
terminates processing of the command line. An ERROR is also generated if too many values are specified. In case of an
error, all previous values of the parameter are unaffected.

2.4.4.3 Parameter Read Command Syntax

The DTE may determine the current value or values stored in a parameter by using the following syntax:

+<name>?

The modem responds by sending the current values stored for the parameter to the DTE in an information text response. The
format of this response is described in the definition of the parameter. Generally, the values are sent in the same form in
which they would be issued by the DTE in a parameter setting command; if multiple values are supported, they will generally
be separated by commas, as in a parameter setting command.

2.4.4.4 Parameter Test Command Syntax

The DTE may test if a parameter is implemented in the modem, and determine the supported values, by using the syntax:

+<name>=?

If the modem does not recognize the indicated name, it returns an ERROR result code and terminates processing of the
command line. If the modem does recognize the parameter name, it returns an information text response to the DTE, followed
by an OK result code. The information text response indicates the values supported by the modem for each such
subparameter, and possibly additional information. The format of this information text is defined for each parameter.

2.4.5 Additional Syntax Rules

2.4.5.1 Concatenating Commands after Extended Syntax Commands

Additional commands may follow an extended-syntax command on the same command line if a semicolon (";") is inserted
after the preceding extended command as a separator. The semicolon is not necessary when the extended syntax command
is the last command on the command line.

2.4.5.2 Concatenating Commands after Basic Format Commands

Extended syntax commands may appear on the same command line after a basic syntax command without a separator, in
the same manner as concatenation of basic syntax commands.

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2.5 Issuing Commands

All characters in a command line must be issued at the same data rate, and with the same parity and format.

The modem will ignore any command line that is not properly terminated. The modem may consider 30 seconds of mark idle
time between any two characters as an improperly terminated command line. In this case the modem may or may not
generate an ERROR message. The modem will ignore any characters received from the DTE that are not part of a properly­formatted command line.

If the maximum number of characters that the modem can accept in the body is exceeded, an ERROR result code is
generated after the command line is terminated.

The DTE will not begin issuing a subsequent command line until at least one-tenth of a second has elapsed after receipt of
the entire result code issued by the modem in response to the preceding command line.

2.6 Executing Commands

Upon receipt of the termination character, the modem commences execution of the commands in the command line in the
order received from the DTE. Should execution of a command result in an error, or a character be not recognized as a valid
command, execution is terminated, the remainder of the command line is ignored, and the ERROR result code is issued.
Otherwise, if all commands execute correctly, only the result code associated with the last command is issued; result codes
for preceding commands are suppressed. If no commands appear in the command line, the OK result code is issued.

2.6.1 Aborting Commands

Some action commands that require time to execute may be aborted while in progress; these are explicitly noted in the
description of the command. Aborting of commands is accomplished by the transmission from the DTE to the modem of any
character. A single character is sufficient to abort the command in progress; however, characters transmitted during the first
125 milliseconds after transmission of the termination character are ignored (to allow for the DTE to append additional control
characters such as line feed after the command line termination character).

recognized by the modem, it should be sent at the same rate as the preceding command line; the modem may ignore
characters sent at other rates.

command in progress and returns an appropriate result code to the DTE, as specified for the particular command.

When such an aborting event is recognized by the modem, the modem terminates the

To ensure that the aborting character is

2.6.2 Handling of Invalid Numbers and S-Parameter Values

The modem reacts to undefined numbers and S-parameter values in one of three ways:

1. Issue the ERROR result code, and leave the previous value of the parameter unchanged;

2. Issue the OK result code, and leave the previous value of the parameter unchanged; or,

3. Issue the OK result code, and set the parameter value to the valid value nearest to that specified in the command line.
The description of each command specifies which of these three techniques is used to handle invalid parameter values for

that command or parameter.

2.7 Modem Responses

While in command state and online command state, the modem will issue responses using the same rate, word length, and
parity as the most recently received DTE command line. In the event that no DTE command has yet been received, rate, word
length, and parity used will depend on the capabilities of the modem.

When the modem transitions from the command state or online command state to the online data state, the result code

CONNECT

online data state to the command state or online command state, the result codes should be issued at the bit rate used during
the online data state. Thereafter, any unsolicited result codes should use the bit rate and parity of the last command line
issued by the DTE to the modem.

The characters of a response will be contiguous, with no more than 100 milliseconds of mark idle issued between characters
in addition to stop elements.

should be issued at the bit rate and parity used during the command state. When the modem transitions from the

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2.7.1 Responses

There are two types of responses that may be issued by the modem: information text and result codes.

Information Text.

1. The characters transmitted for the header are determined by the V command.

2. The trailer consists of two characters, being the character having the ordinal value of parameter S3 followed by the
character having the ordinal value of parameter S4.

3. Information text usually consists of a single line; information text returned in response to some commands may contain
multiple lines, and the text may therefore include CR, LF, and other formatting characters to improve readability.

Result Code Parts.

1. The characters transmitted for the header and trailer are determined by the V command setting.

2. The result text may be transmitted as a number or as a string, also depending on a the V command setting.

Result Code Types.

Section 3.5.

1. A final result code indicates the completion of a full modem action and a ability to accept new commands from the DTE.

2. An intermediate result code is a report of the progress of an modem action. The CONNECT result code is an
intermediate result code. In the case of a dialing or answering command, the modem switches from command state to
online data state, and issues a CONNECT result code. This is an intermediate result code for the modem because it
cannot accept commands from the DTE while in online data state. When the modem switches back to the command
state it then issues a final result code (such as OK or NO CARRIER).

3. Unsolicited result codes (such as RING) indicate the occurrence of an event not directly associated with the issuance of
a command from the DTE.

Information text responses consist of three parts: a header, information text, and a trailer:

Result codes consist of three parts: a header, the result text, and a trailer.

There are three types of result codes: final, intermediate, and unsolicited. Result codes are described in

2.7.2 Extended Syntax Result Codes

Extended syntax result codes may be issued in response to either basic or extended commands, or both. The appropriate
responses are specified in the definitions of the commands, the responses, or both.

The general format of extended syntax result codes is the same as result codes defined in TIA-602 with regard to headers
and trailers. The characters specified in S-parameters S3 and S4 are used in headers and trailers of extended syntax result
codes as they are in basic format result codes. The setting of the V command affects the headers and trailers associated with
extended syntax result codes in the same manner as basic format result codes; however, unlike basic format result codes,
extended syntax result codes have no numeric equivalent, and are always issued in alphabetic form.

Extended syntax result codes are subject to suppression by the Q1 command, as with basic format result codes. The
issuance of extended syntax result codes are not be affected by the setting of the X command.

Extended syntax result codes may be either final, intermediate, or unsolicited; the type being indicated in the definition of the
result code.

Extended syntax result codes are prefixed by the "+" character to avoid duplication of basic format result codes specified in
TIA-602. Following the "+" character, the name of the result code appears; result code names follow the same rules as
command names.

Extended syntax result codes may include the reporting of values. The definition of the result code specifies whether or not
values are appended to the result code, and, if so, how many, their types, and their assumed default values if omitted.

Data/voice Modes.

+<name>

If a single value is to be reported, the form of the result code is:

When no values are to be reported, the result code appears in the simplest form:

+<name>: <value>

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A single space character separates the colon character from the <value>; no space appears between the result code name
and the colon. If multiple values are to be reported with the result code, the form is:

+<name>: <compound_value>

Fax Modes.

<value> or (<value>)

2.7.3 +<name>: <compound_value>Information Text Formats for Test Commands

In general, the format of information text returned by extended syntax commands is described in the definition of the
command.

The modem may insert intermediate <CR> characters in very long information text responses in order to avoid overrunning
DTE receive buffers. If intermediate <CR> characters are included, the modem does not include the character sequences "0
<CR>"or "OK<CR>", so that DTE can avoid false detection of the end of these information text responses.

2.7.3.1 Range of Values

When the action accepts a single numeric subparameter, or the parameter accepts only one numeric value, the set of
supported values may be presented in the information text as an ordered list of values. The list is preceded by a left
parenthesis (() , and is followed by a right parenthesis ()). If only a single value is supported, it appears between the
parentheses. If more than one value is supported, then the values may be listed individually, separated by comma characters,
or, when a continuous range of values is supported, by the first value in the range, followed by a hyphen character (-),
followed by the last value in the range. The specification of single values and ranges of values may be intermixed within a
single information text. In all cases, the supported values are indicated in ascending order.

For example, the following are some examples of value range indications:

(0) Only the value 0 is supported.
(1,2,3) The values 1, 2, and 3 are supported.
(1-3) The values 1 through 3 are supported.

If a single value is to be reported, the form of the result code is:

(0,4,5,6,9,11,12) The several listed values are supported.
(0,4-6,9,11-12) An alternative expression of the above list.

2.7.3.2 Compound Range of Values

When the action accepts more than one subparameter, or the parameter accepts more than one value, the set of supported
values is presented as a list of the parenthetically-enclosed value range strings described above, separated by commas. For
example, the information text in response to testing an action that accepts three subparameters, and supports various ranges
for each of them, could appear as follows:

(0),(1-3),(0,4-6,9,11-12)

This indicates that the first subparameter accepts only the value 0, the second accepts any value from 1 through 3 inclusive,
and the third subparameter accepts any of the values 0, 4, 5, 6, 9, 11, or 12.

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3. DATA COMMAND SET

3.1 COMMAND GUIDELINES

The commands used to control and report modem operation in data modem mode are defined in this section.
The Data Modem Mode commands and responses described in this section are applicable when command +FCLASS=0.

(See Section 3.2.1.2 for the definition of the FCLASS command.)
The default values are typical of a fully configured modem supporting all data rates and options. The actual default value is

dependent upon modem software as defined by the .INF File.
Commands are accepted by the modem once the previous command has been fully executed, which is normally indicated by

the return of an appropriate result code. Execution of commands D and A, either as a result of a direct command or a re­execute command, will be aborted if another character is entered before completion of the handshake.

3.1.1 Escape Code Sequence

When the modem has established a connection and has entered on-line data mode, it is possible to break into the data
transmission in order to issue further commands to the modem in an on-line command mode. This is achieved by the DTE
sending to the modem a sequence of three ASCII characters specified by register S2. The default character is '+'. The
maximum time allowed between receipt of the last character of the three escape character sequence from the DTE and
sending of the OK result code to the DTE is controlled by the S12 register.

3.2 DATA COMMANDS

The modem will respond to the commands detailed below. Parameters applicable to each command are listed with the
command description. The defaults shown correspond to default values provided in the .INF File.

3.2.1 Generic Modem Control

3.2.1.1 Z - Reset to Default Configuration

This command instructs the modem to reset to default values as altered by non-volatile parameter storage. If the modem is
connected to the line, it will be disconnected from the line, terminating any call in progress.

All of the functions of the command are completed before the modem issues the result code. The DTE should not include
additional commands on the same command line after the Z command because such commands are ignored.

Syntax

Z

Result Code

OK

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3.2.1.2 +FCLASS - Select Active Service Class

This command selects the active service class (mode).
Syntax

+FCLASS=<mode>

Defined Values

<mode> Decimal number which corresponds to the selected service class.

0 Select Data Mode (see Section 3). (Default.)
1 Select Facsimile Class 1 Mode (see Section 4)

1.0 Select Facsimile Class 1.0 Mode (see Section 4)
8 Select Voice Mode (see Section 5)
80 Select VoiceView Mode (see Section 5)

Result Codes

OK For <mode> = 0, 1, 1.0, 8, and 80 as supported by the .INF File.
ERROR Otherwise.

Reporting Current or Selected Values
Command: +FCLASS?

Response: +FCLASS: <mode>
Example: +FCLASS: 0 For the default setting.

Reporting Supported Range of Parameter Values
Command: +FCLASS=?

Response: +FCLASS: (<mode> range)
Example: +FCLASS: (0, 1,1.0,8, 80)

3.2.1.3 +VCID - Caller ID (CID)

This command controls the reporting and presentation of data associated with the Caller ID services in the U.S. and Canada
in the Incoming Call Line ID (ICLID) data format.

Syntax

+VCID=<pmode>

Defined Values

<pmode> Decimal number corresponding to the selected option.

0 Disable Caller ID reporting. (Default).
1 Enables Caller ID with formatted presentation to the DTE. The modem will present the

data items in a <Tag><Value> pair format. The expected pairs are data, time, caller
code (telephone number), and name.

2 Enables Caller ID with unformatted presentation to the DTE.

Reporting Current or Selected Values
Command: +VCID?

Response: +VCID: <pmode>
Example: +VCID: 0 For the default setting.

Reporting Supported Range of Parameter Values
Command: +VCID=?

Response: +VCID: (<pmode> range)
Example: +VCID: (0,1,2)

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3.2.1.4 \N - Operating Mode

This command controls the preferred error correcting mode to be negotiated in a subsequent data connection.
Syntax

\N<mode>

Defined Values

<mode> Decimal number which corresponds to the selected mode.

0 Selects normal speed buffered mode (disables error-correction mode) and forces &Q6

(selects asynchronous operation in normal mode.)
1 Same as \N0.
2 Selects reliable (error-correction) mode and forces &Q5 (the modem will try to negotiate

an error corrected link). The modem will first attempt a LAPM connection and then an

MNP connection. Failure to make a reliable connection results in the modem hanging

up.
3 Selects auto reliable mode and forces &Q5 (the modem will try to negotiate an error

corrected link). This operates the same as \N2 except failure to make a reliable

connection results in the modem falling back to the speed buffered normal mode.
4 Selects LAPM error-correction mode and forces &Q5 (the modem will try to negotiate

an error corrected link). Failure to make an LAPM error-correction connection results in

the modem hanging up.
5 Selects MNP error-correction mode and forces &Q5 (the modem will try to negotiate an

error corrected link). Failure to make an MNP error-correction connection results in the

modem hanging up.

Result Codes

OK <mode> = 0 to 5.
ERROR Otherwise.

3.2.1.5 &F - Set to Factory-Defined Configuration

This command instructs the modem to set all parameters to factory default values defined in the product Configuration Table
The modem loads the factory default configuration (profile). The factory defaults are identified for each command and in the

S-Parameter descriptions. A configuration (profile) consists of a subset of S-Parameters.
Syntax

&F

Result Code

OK

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3.2.1.6 &T - Local Analog Loopback Test

The modem will perform the local analog loopback test if &T1 is selected. The test can be run only when in an asynchronous
operation in non-error-correction mode (normal). To terminate the test in progress, the escape sequence must be entered first
(see Section 3.1.1). If S18 is non-zero, the test will terminate automatically after the time specified by S18 and the OK result
code will be reported.

Syntax

&T[<value>]

Defined Values

<value> Decimal number corresponding to the selected value.

0 Terminates test in progress.
1 Initiates local analog loopback, V.54 Loop 3. If a connection exists when this command

is issued, the modem hangs up. The CONNECT XXXX message is displayed upon the

start of the test.

3.2.1.7 I - Request Identification Information

This command causes the modem to report one or more lines of product information text, as selected by the <value>
subparameter, followed by a final result code.

Syntax

I[<value>]

Defined Values

<value> Decimal number corresponding to the selected information.

0 Reports product code, e.g.:

ATI0
56000
OK

1 Reports the least significant byte of the stored checksum in decimal (see firmware

release notes). Reports 255 if the prestored checksum value is FFh, e.g.,

ATI1
255
OK

2 Reports OK, e.g.:

ATI2
OK
OK

3 Reports identification codes, e.g.:

ATI3

2.1.2.127
OK

4 Reports product description from the .INF file (the response is customizable by

customizing the INF file), e.g.:

ATI4
Conexant HCF 56K Data,Fax,Speakerphone
OK

5 Reports Country Code parameter (in decimal), e.g.:

ATI5
181
OK

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Result Codes

OK <value> = 0-9.
ERROR Otherwise.

Command Reference Manual

6 Reports modem data pump model and internal code revision, e.g.:

ATI6
DP Rev
V90 SPX RAM Ver 28
V90 CTL RAM Ver 28
K56FLEX SPX RAM Ver 44
K56FLEX CTL RAM Ver 47
OK

7 Reports modem data pump model and internal code revision, e.g.:

ATI7
255
OK

8 Reports OK, e.g.:

ATI8
OK

9 Reports country, e.g.:

ATI9
USA
OK

3.2.1.8 +GMI - Request Manufacturer Identification

This command causes the modem to report the modem product manufacturer as provided by the .INF File.
Syntax

+GMI

Typical Response

+GMI: Conexant
OK

3.2.1.9 +GMM - Request Model Identification

This command causes the modem to report the modem product model as provided by the .INF File.
Syntax

+GMM

Typical Response

+GMM: HCF 56K Data, Fax, Speakerphone, PCI Modem
OK

3.2.1.10 +GMR - Request Revision Identification

This command causes the modem to report the modem version, revision level, or date as provided by the .INF File.
Syntax

+GMR

Typical Response

+GMR: 1.0
OK

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3.2.1.11 +GSN - Request Product Serial Number Identification

This command causes the modem to report the modem product model serial number as provided by the .INF File.
Syntax

+GSN

Typical Response

+GSN:
OK

3.2.1.12 +GOI - Request Global Object Identification

This command causes the modem to transmit one or more lines of information text identifying the device, based on the ISO
system for registering unique object identifiers. Typically, the text consists of a single line containing numeric strings delimited
by period characters. The general format of object identifiers is defined in Section 28 of ITU-T Recommendation X.208; the
encoding rules are defined in ITU-T Recommendation X.209. The response is provided by the .INF file.

Syntax

+GOI

Typical Response

+GOI:
OK

3.2.1.13 +GCAP - Request Complete Capabilities List

This extended-format command causes the modem to transmit one or more lines of information text listing additional
capabilities command +<name>s , which is intended to permit the user to identify the overall capabilities of the modem. In
particular, if the modem implements a particular modem control standard that uses Extended Syntax Commands, and if that
modem control standard includes command(s) that indicate general capabilities, the +<names>(s) of those commands will be
reported to the modem in response to a +GCAP command.

Syntax

+GCAP

Example Responses

+GCAP: +FCLASS, +MS, +ES, +DS, for a data modem that supports all capabilities listed
Where:
+FCLASS T.class1, +F (Class 1 Facsimile modem Control)
+MS +M commands (Modulation Control: +MS and +MR commands)
+ES +E commands (Error Control: +ES, +EB, +ER, +EFCS, +ETBM)
+DS +D commands (Data Compression: +DS and +DR)

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3.2.1.14 +GCI - Country of Installation

This extended syntax command indicates and selects the country of installation for the modem. This parameter selects the
settings for any operational parameters that need to be adjusted for national regulations or telephone networks.

Syntax

+GCI=<country_code>

Defined Values

<country_code> 8-bit country code from Annex A of T.35. The value is the hexadecimal equivalent of the T.35 code,

with bit 8 treated as the most significant bit and bit 1 treated as the least significant bit.

Default
If the modem is specified for use in only one country, that country code is the default. Otherwise, the default is the expected

country of sale or first installation. The modem may use hardware means to select the country of installation, in which case
the modem uses that to determine the default value.

Reporting Current or Selected Values
Command: +GCI?

Response: +GCI: <current country_code>
Example: +GCI: 3D Indicates that the modem is set for France.

Reporting Supported Range of Parameter Values
Command: +GCI=?

Response: +GCI: (<country_code>[,<country_code>[,<country_code].......]]

Example: +GCI: (20,73,B5) The modem can be set for Canada, Mexico or the United States.

3.2.2 DTE-Modem interface commands

The parameters defined in this section control the operation of the interface between the DTE and modem.

3.2.2.1 E - Command Echo

The modem enables or disables the echo of characters to the DTE according to the parameter supplied.
Syntax

E[value>]

Defined Values

<value> Decimal number corresponding to the selected option.

0 Disables command echo.
1 Enables command echo. (Default.)

Result Codes

OK <value> = 0 or 1.
ERROR Otherwise.

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3.2.2.2 Q - Quiet Results Codes Control

The command enables or disables the sending of result codes to the DTE according to the parameter supplied. The
parameter value, if valid, is written to S14 bit 2.

Syntax

O[value>]

Defined Values

<value> Decimal number corresponding to the selected option.

0 Enables result codes to the DTE. (Default.)
1 Disables result codes to the DTE.

Result Codes

OK <value> = 0 or 1.
ERROR Otherwise.

3.2.2.3 V - Result Code Form

This command selects the sending of short-form or long-form result codes to the DTE.
Syntax

V[value>]

Defined Values

<value> Decimal number corresponding to the selected option.

0 Enables short-form (terse) result codes. Line feed is not issued before a short-form

result code.
1 Enables long-form (verbose) result codes. (Default.)

Result Codes

OK <value> = 0 or 1.
ERROR Otherwise.

3.2.2.4 W - Connect Message Control

This command, in conjunction with S95 bits 0, 2, 3, and 5 (bits 2, 3, and 5 can be written directly by the host or by the +MR,
+ER, and +DR commands, respectively), control the format of CONNECT messages (see Section 3.5 and Table 3-14). The
actual result code messages reported reflect the W command setting and the S95 bit settings. (Also see +MR, +ER, and +DR
commands.)

Syntax

W[value>]

Defined Values

<value> Decimal number corresponding to the selected option.

0 Upon connection, the modem reports only the DTE speed (e.g., CONNECT 19200).

Subsequent responses are disabled. (Default.)
1 Upon connection, the modem reports the line speed, the error correction protocol, and

the DTE speed, respectively. Subsequent responses are disabled.
2 Upon connection, the modem reports the DCE speed (e.g., CONNECT 14400).

Subsequent responses are disabled.

Result Codes

OK <value> = 0-3.
ERROR Otherwise.

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3 Upon connection, the modem reports DCE speed and the error correction protocol.

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3.2.2.5 X - Extended Result Codes

This command selects the subset of the result code messages used by the modem to inform the DTE of the results of
commands.

Blind dialing is enabled or disabled by country parameters. If the user wishes to enforce dial tone detection, a "W" can be
placed in the dial string (see D command). The information below is based upon the default implementation of the X results
table. Table 3-1 indicates the messages which are enabled for each X value.

If the modem is in facsimile mode (+FCLASS=1, or 1.0), the only message sent to indicate a connection is CONNECT without
a speed indication.

Syntax

X<value>

Defined Values

<value> Decimal number corresponding to the selected option.

0 CONNECT result code is given upon entering online data state. Dial tone and busy

detection reporting are disabled.
1 CONNECT <text> result code is given upon entering online data state. Dial tone and

busy detection reporting are disabled.
2 CONNECT <text> result code is given upon entering online data state. Dial tone

detection reporting is enabled, and busy detection reporting is disabled.
3 CONNECT <text> result code is given upon entering online data state. Dial tone

detection reporting is disabled, and busy detection reporting is enabled.

Result Codes

OK <value> = 0 to 4.
ERROR Otherwise.

4 CONNECT <text> result code is given upon entering online data state. Dial tone and

busy detection reporting are both enabled. (Default.)

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Table 3-1. Result Codes

Short Form Long Form n Value in ATXn Command Notes

01234

+F4+FCERROR xxxxx

0OK xxxxx
1CONNECT xxxxx
2RING xxxxx
3NO CARRIER xxxxx
4ERROR xxxxx
5 CONNECT 1200 1 xxxx
6 NO DIALTONE 3 3 x x x
7 BUSY 333xx
8NO ANSWER xxxxx

9CONNECT 600 1xxxx
10 CONNECT 2400 1 xxxx
11 CONNECT 4800 1 xxxx
12 CONNECT 9600 1 xxxx
13 CONNECT 7200 1 xxxx
14 CONNECT 12000 1 xxxx
15 CONNECT 14400 1 xxxx
16 CONNECT 19200 1 xxxx
17 CONNECT 38400 1 xxxx
18 CONNECT 57600 1 xxxx
19 CONNECT 115200 1 xxxx
20 CONNECT 230400 xxxxx
22 CONNECT 75TX/1200RX 1 xxxx
23 CONNECT 1200TX/75RX 1 xxxx
24 DELAYED 4444x
32BLACKLISTED 4444x
33FAX xxxxx
35DATA xxxxx
40+MRR: 300 xxxxx
44 +MRR: 1200/75 xxxxx
45 +MRR: 75/1200 xxxxx
46 +MRR: 1200 xxxxx
47 +MRR: 2400 xxxxx
48 +MRR: 4800 xxxxx
49 +MRR: 7200 xxxxx
50 +MRR: 9600 xxxxx
51 +MRR: 12000 xxxxx
52 +MRR: 14400 xxxxx
53 +MRR: 16800 xxxxx
54 +MRR: 19200 xxxxx
55 +MRR: 21600 xxxxx
56 +MRR: 24000 xxxxx
57 +MRR: 26400 xxxxx
58 +MRR: 28800 xxxxx
59 CONNECT 16800 1 xxxx
61 CONNECT 21600 1 xxxx
62 CONNECT 24000 1 xxxx

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Table 3-1. Result Codes (Cont'd)

Short Form Long Form n Value in ATXn Command Notes

01234

63 CONNECT 26400 1 x x x x
64 CONNECT 28800 1 x x x x
66+DR: ALT xxxxx
67+DR: V42B xxxxx
69+DR: NONE xxxxx
70+ER: NONE xxxxx
77+ER: LAPM xxxxx
78 +MRR: 31200 xxxxx
79 +MRR: 33600 xxxxx
80+ER: ALT xxxxx
83LINE IN USE xxxxx
84 CONNECT 33600 1 x x x x
91 CONNECT 31200 1 x x x x

134+MCR: B103 xxxxx
135+MCR: B212 xxxxx
136+MCR: V21 xxxxx
137+MCR: V22 xxxxx
138+MCR: V22B xxxxx
139+MCR: V23 xxxxx
140+MCR: V32 xxxxx
141+MCR: V32B xxxxx
142+MCR: V34 xxxxx
144+MCR: K56 xxxxx
145+MCR: V90 xxxxx
150 +MRR: 32000 xxxxx
151 +MRR: 34000 xxxxx
152 +MRR: 36000 xxxxx
153 +MRR: 38000 xxxxx
154 +MRR: 40000 xxxxx
155 +MRR: 42000 xxxxx
156 +MRR: 44000 xxxxx
157 +MRR: 46000 xxxxx
158 +MRR: 48000 xxxxx
159 +MRR: 50000 xxxxx
160 +MRR: 52000 xxxxx
161 +MRR: 54000 xxxxx
162 +MRR: 56000 xxxxx
165 CONNECT 32000 xxxxx
166 CONNECT 34000 xxxxx
167 CONNECT 36000 xxxxx
168 CONNECT 38000 xxxxx
169 CONNECT 40000 xxxxx

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Table 3-1. Result Codes (Cont'd)

Short Form Long Form n Value in ATXn Command Notes

01234

170 CONNECT 42000 xxxxx
171 CONNECT 44000 xxxxx
172 CONNECT 46000 xxxxx
173 CONNECT 48000 xxxxx
174 CONNECT 50000 xxxxx
175 CONNECT 52000 xxxxx
176 CONNECT 54000 xxxxx
177 CONNECT 56000 xxxxx
178 CONNECT 230400 xxxxx
180 CONNECT 28000 xxxxx
181 CONNECT 29333 xxxxx
182 CONNECT 30667 xxxxx
183 CONNECT 33333 xxxxx
184 CONNECT 34667 xxxxx
185 CONNECT 37333 xxxxx
186 CONNECT 38667 xxxxx
187 CONNECT 41333 xxxxx
188 CONNECT 42667 xxxxx
189 CONNECT 45333 xxxxx
190 CONNECT 46667 xxxxx
191 CONNECT 49333 xxxxx
192 CONNECT 50667 xxxxx
193 CONNECT 53333 xxxxx
194 CONNECT 54667 xxxxx
195 +MRR: 28000 xxxxx
196 +MRR: 29333 xxxxx
197 +MRR: 30667 xxxxx
198 +MRR: 33333 xxxxx
199 +MRR: 34667 xxxxx
200 +MRR: 37333 xxxxx
201 +MRR: 38667 xxxxx
202 +MRR: 41333 xxxxx
203 +MRR: 42667 xxxxx
204 +MRR: 45333 xxxxx
205 +MRR: 46667 xxxxx
206 +MRR: 49333 xxxxx
207 +MRR: 50667 xxxxx
208 +MRR: 53333 xxxxx
209 +MRR: 54667 xxxxx

Notes:

1. An 'x' in a column indicates that the message (either the long form if verbose, or the value only for s hort form) will be
generated when that particular value of 'n' (s hown at the top of the column) has been s el ected by the use of ATXn. If
the column is blank, then no message will be generated for that x option. A numeral indicates which less explicit
message (verbose or short form) will be output for that X option. (Also, see Section 3.3).

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3.2.2.6 &C - RLSD Behavior

This parameter determines how the state of the Received Line Signal Detector (RLSD) output relates to the detection of
received line signal from the distant end. Changing the parameter will take effect immediately in both the command and
online command states.

In &C1 mode of operation, RLSD is not turned off until all data previously received from the remote modem is delivered to the
local DTE. However, such buffered data will be discarded and RLSD will be turned off if the DTE turns off DTR (if &D1 or &D2
is set).

Syntax

&C[<value>] <value> = 0 or 1.

Defined Values

<value> Decimal number corresponding to the selected option.

0 RLSD is always ON.
1 RLSD follows the state of the carrier. (Default.)

Result Code

OK <value> = 0 or 1
ERROR Otherwise.

3.2.2.7 &D - DTR Behavior

This parameter determines how the modem responds when the Data Terminal Ready (DTR) input is changed from the ON to
the OFF condition during online data state.

Syntax

&D[<value>] <value> = 0 - 2.

Defined Values

<value> Decimal number corresponding to the selected option.

0 Modem ignores DTR.
1 Upon an on-to-off transition of DTR, the modem enters online command state and

issues an OK result code; the call remains connected.

2 Upon an on-to-off transition of DTR, the modem instructs the underlying modem to

perform an orderly cleardown of the call. The disposition of any data in the modem
pending transmission to the remote modem is controlled by the +ETBM parameter;
otherwise, this data is sent before the call is cleared, unless the remote modem clears
the call first (in which case pending data is discarded). The modem disconnects from
the line. Automatic answer is disabled while DTR remains off.

Result Code

OK <value> = 0 or 2
ERROR Otherwise.

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3.2.2.8 &K - Flow Control

This command defines the DTE/DCE (terminal/modem) flow control mechanism.
Syntax

&K[<value>]

Defined Values

<value> Decimal number corresponding to the selected option.

0 Disables flow control.
3 Enables RTS/CTS flow control. (Default for data modem modes.)
4 Enables XON/XOFF flow control.
5 Included for compatibility only and has no effect other than returning an OK result code.
6 Included for compatibility only and has no effect other than returning an OK result code.

Result Codes

OK <value> = 0, 3, 4, 5, or 6.
ERROR Otherwise.

3.2.2.9 &M - Asynchronous/Synchronous Mode Selection

This command is included for compatibility only and has no effect other than returning a result code. The only valid values
are 0-3.

Syntax

&M[<mode>]

Defined Values

<mode > Decimal number corresponding to the selected value: 0-3.

Result Codes

OK <mode> = 0 to 3.
ERROR Otherwise.

3.2.2.10 &Q - Sync/Async Mode

This command determines the DTR operating mode. (Also, see \N.)

When the &Q0 is issued to select the mode, the subsequent connect message will report the DCE speed regardless

NOTE:

of the W command and S95 settings.
Syntax

&Q[<mode>]

Defined Values

<mode > Decimal number corresponding to the selected mode:

0 Selects asynchronous operation in normal mode (speed buffering)
1 Selects asynchronous operation in normal mode (speed buffering)
2 Selects asynchronous operation in normal mode (speed buffering)
3 Selects asynchronous operation in normal mode (speed buffering)

Result Codes

3-14

5 Selects asynchronous operation in error correction mode
6 Selects asynchronous operation in normal mode (speed buffering).

OK <mode > = 0-3, 5, 6.
ERROR Otherwise.

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3.2.2.11 +IPR - Fixed DTE Rate

This numeric extended-format parameter specifies the data rate at which the modem will accept commands during online
operation. It may be used to select operation at rates at which the modem is not capable of automatically detecting the data
rate being used by the DTE. Specifying a value of 0 disables the function and allows operation only at rates automatically
detectable by the modem. The specified rate takes effect following the issuance of any result code(s) associated with the
current command line.

The <rate> specified does not apply in OnLine Data State if Normal Mode (Direct Mode) of operation is selected.
Syntax

+IPR=<rate>

Defined Values

<rate> Specifies the DTE-modem interface operation rate in bits/s. The available rates are:

0, 2400, 4800, 9600, 19200, 38400, or 57600

If unspecified or set to 0, automatic detection is selected and the character format is also forced to
autodetect, +ICF=0.

If the rate specified is not supported by the modem, an ERROR result code will be returned.

Reporting Current or Selected Values
Command: +IPR?

Response: +IPR: <rate>
Example 1: +IPR: 0 for automatic rate detection.
Example 2: +IPR: 57600 for 57600 bps.

Reporting Supported Range of Parameter Values
Command: +IPR=?

Response: +IPR (<rate> range)
Example: +IPR: (0, 2400,4800,9600,19200,38400,57600)

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3.2.2.12 +IFC - DTE-Modem Local Flow Control

This extended-format compound parameter controls the operation of local flow control between the DTE and the modem
during the data state when V.42 error control is used, or when fallback to non-error control mode is specified to include
buffering and flow control. It accepts two numeric subparameters.

Syntax

+IFC=[<modem_by_DTE>[,<DTE_by_modem>]]

Defined Values

<modem_by_DTE> Specifies the method to be used by the DTE to control the flow of received data from the modem.

0 None.
1 XON/XOFF on transmitted data (XON/XOFF on transmit data); do not pass XON/XOFF

characters to the remote modem.

2 Circuit 133 (Ready for Receiving). (Default.)

<DTE_by_modem> Specifies the method to be used by the modem to control the flow of transmitted data from the DTE.

0 None.
1 XON/XOFF on received data.
2 CTS/RTS. (Default.)

Reporting Current or Selected Values
Command: +IFC?

Response: +IFC: <modem_by_DTE>,<DTE_by_modem>
Example: +IFC: 2,2 for the defaults.

Reporting Supported Range of Parameter Values
Command: +IFC=?

Response: +IFC: (<modem_by_DTE> range),(<DTE_by_modem> range)
Example: +IFC: (0-2),(0-2)

3.2.2.13 +ILRR - DTE-Modem Local Rate Reporting

This extended-format numeric parameter controls whether or not the extended-format +ILRR:<rate> information text is
transmitted from the modem to the DTE.

Syntax

+ILRR=<value>

Defined Values

<value> Decimal number corresponding to the selected option.

0 Disables reporting of local port rate (+ILRR: is not transmitted).
1 Enables reporting of local port rate (+ILRR: is transmitted).

Reporting Current or Selected Values
Command: +ILRR?

Response: +ILRR: <current value>
Example: +ILRR: 0 For the default setting

Reporting Supported Range of Parameter Values
Command: +ILRR=?

Response: +ILRR: (<value> range)
Example: +ILRR: (0,1)

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Reported Rate
The <rate> reported represents the current (negotiated or renegotiated) DTE-modem rate. If enabled, the intermediate result

code is transmitted after any modulation, error control or data compression reports are transmitted, and before any final result
code (e.g., CONNECT) is transmitted. The <rate> is applied after the final result code is transmitted.

The DTE-modem port rate will change only if neither buffered mode nor error controlled means are enabled (+ES=x,0) and if
the negotiated carrier rate (+MRR) does not match the current DTE-modem port rate (autodetected from the previous
command line).

Syntax

+ILRR: <rate>[,<rx_rate>]

Defined Values

<rate> Decimal value representing the current (negotiated or renegotiated) DTE-modem rate:

0, 300, 1200, 2400, 4800, 9600, 19200, 38400, 57600, or 115200

<rx_rate> Optional decimal value reporting the RXD rate, if it is different from the TXD rate:

0, 300, 1200, 2400, 4800, 9600, 19200, 38400, 57600, or 115200

Example

+ILRR: 19200

3.2.3 Call Control

3.2.3.1 D - Dial

This command directs the modem to go on-line, dial according to the entered string and attempt to establish a connection. If
no dial string is supplied, the modem will go on-line and attempt the handshake in originate mode.
command is issued before the S1 register has cleared, the modem will respond with the NO CARRIER result code.

NOTE:

If the ATD

If +FCLASS=0 is selected, the modem will behave as a data modem and will attempt to connect to another data modem. The
modem will have up to the period of time specified by register S6 or S7 to wait for carrier and complete the handshake. If this
time expires before the modem can complete the handshake, the modem will go on-hook with the NO CARRIER response.
This command will be aborted upon receipt of any DTE character before completion of the handshake.

If +FCLASS=1 or 1.0 is selected, the modem will behave as a facsimile modem and attempt to connect to a facsimile machine
(or modem) by entering the HDLC V.21 channel 2 receive state (as if +FRH=3 had been issued). This command will be
aborted upon receipt of any DTE character if the modem has not finished dialing. In this case, the modem will go on-hook and
return to command mode after displaying the NO CARRIER message. If the modem finishes dialing, it will proceed as if the
+FRH=3 command is issued. (Refer to the +FRH command to determine how the modem behaves following this stage.)

Syntax

D<modifier>

Defined Values

<modifier> The valid dial string parameters (modifiers) are described below. Punctuation characters may be

used for clarity, with parentheses, hyphen, and spaces ignored.
0-9 DTMF digits 0 to 9.
A-D DTMF digits A, B, C, and D. Some countries may prohibit sending of these digits during dialing.
L Re-dial last number: the modem will re-dial the last valid telephone number. The L must be

immediately after the D with all the following characters ignored).
P Select pulse dialing: pulse dial the numbers that follow until a "T" is encountered. Affects current and

subsequent dialing. Some countries prevent changing dialing modes after the first digit is dialed.
T Select tone dialing: tone dial the numbers that follow until a "P" is encountered. Affects current and

subsequent dialing. Some countries prevent changing dialing modes after the first digit is dialed.
W Wait for dial tone: the modem will wait for dial tone before dialing the digits following "W". If dial tone

is not detected within the time specified by S7 or S6, the modem will abort the rest of the sequence,

return on-hook, and generate an error message.

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* The 'star' digit (tone dialing only).
# The 'gate' digit (tone dialing only).
+
! Flash: the modem will go on-hook for a time defined by the value of S29. Country requirements may

limit the time imposed.
@ Wait for silence: the modem will wait for at least 5 seconds of silence in the call progress frequency

band before continuing with the next dial string parameter. If the modem does not detect these 5

seconds of silence before the expiration of the call abort timer (S7), the modem will terminate the call

attempt with a NO ANSWER message. If busy detection is enabled, the modem may terminate the

call with the BUSY result code. If answer tone arrives during execution of this parameter, the modem

will handshake.
$ Wait for credit card dialing tone before continuing with the dial string. If the tone is not detected within

the time specified by S7 or S6, the modem will abort the rest of the sequence, return on-hook, and

generate an error message.
& Wait for credit card dialing tone before continuing with the dial string. If the tone is not detected within

the time specified by S7 or S6, the modem will abort the rest of the sequence, return on-hook, and

generate an error message.
, Dial pause: the modem will pause for a time specified by S8 before dialing the digits following ",".
; Return to command state. Added to the end of a dial string. This causes the modem to return to the

command state after it processes the portion of the dial string preceding the ";". This allows the user

to issue additional commands while remaining off-hook. The additional commands may be placed in

the original command line following the ";" and/or may be entered on subsequent command lines.

The modem will enter call progress only after an additional dial command is issued without the ";"

terminator. Use "H" to abort the dial in progress, and go back on-hook.
^ Toggles calling tone enable/disable: applicable to current dial attempt only.
( ) Ignored: may be used to format the dial string.

- Ignored: may be used to format the dial string.
<space> Ignored: may be used to format the dial string.

3.2.3.2 T - Set Tone Dial Default

This command forces DTMF dialing until the next P dial modifier or P command is received. The modem will set an S­Parameter bit to indicate that all subsequent dialing should be conducted in tone mode. Note that the DP command will
override this command. Clears S14 bit 5.

This command may not be permitted in some countries. (See P.)
Syntax

T

Result Codes

OK

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3.2.3.3 P - Set Pulse Dial Default

This command forces pulse dialing until the next T dial modifier or T command is received. Sets S14 bit 5.
As soon as a dial command is executed which explicitly specifies the dialing mode for that particular call (e.g., ATDT..), this

command is overridden so that all future dialing will be tone dialed. (See T command.)
This command may not be permitted in some countries.

3.2.3.4 A - Answer

The modem will go off-hook and will attempt to answer an incoming call if correct conditions are met. Upon successful
completion of answer handshake, the modem will go on-line in answer mode. This command may be affected by the state of
Line Current Sense, if enabled. (Most countries do not require Line Current Sense.) Operation is also dependent upon
+FCLASS command and country-specific requirements.

If +FCLASS=0 is selected, the modem will enter the connect state after exchanging carrier with the remote modem. If no
carrier is detected within a period specified in register S7, the modem will hang up. Any character entered during the connect
sequence will abort the connection attempt.

If +FCLASS=1.0 is selected, the modem will go off-hook in V.21 answer mode. It will generate the V.21 2100 Hz answer tone
for 3 ± 0.5 seconds. Following a delay of 70 ms, it will proceed as if the +FTH=3 command were issued. At any stage up to
(but excluding) the +FTH=3 command state, any character will abort the communication. (See the description of the +FTH
command for details.)

3.2.3.5 H - Disconnect (Hang-Up)

This command initiates a hang up sequence. This command may not be available for some countries due to PTT restrictions.
Syntax

H[<value>]

Defined Values

<value> Decimal number corresponding to the selected option.

0 The modem will release the line if the modem is currently on-line.
1 If on-hook, the modem will go off-hook and remain in command mode.

Result Codes

OK <value> = 0 or 1.
ERROR Otherwise.

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3.2.3.6 O - Return to On-Line Data Mode

This command specifies that the modem will enter the on-line data mode from the on-line command mode with or without a
retrain. If in the off-line command mode when this command is entered, the modem reports ERROR.

Syntax

O[<value>]

Defined Values

<value> Decimal number corresponding to the selected option.

0 Enters on-line data mode from the on-line command mode without a retrain. Handling is

determined by the Call Establishment task. Generally, if a connection exists, this
command connects the DTE back to the remote modem after an escape (+++).

1 Performs a retrain then enters on-line data mode from the on-line command mode.

Result Codes

OK <value> = 0 or 1 and a connection exists.
ERROR Otherwise or no connection exists.

3.2.3.7 L - Speaker Volume

This command sets the speaker volume control according to the parameter supplied.
Syntax

L[<value>]

Defined Values

<value> Decimal number corresponding to the selected option.

0 Off.
1 Low volume. (Default.)
2 Medium volume.
3 High volume.

Result Codes

OK <value> = 0 to 3.
ERROR Otherwise.

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3.2.3.8 M - Speaker Control

This command controls speaker on or off according to the supplied parameter.
Syntax

M[<value>]

Defined Values

<value> Decimal number corresponding to the selected option.

0 Speaker off.
1 Speaker on during call establishment, but off when receiving carrier. (Default.)
2 Speaker on.
3 Speaker is off when receiving carrier and during dialing, but on during answering.

Result Codes

OK <value> = 0 to 3.
ERROR Otherwise.

3.2.3.9 &G - Select Guard Tone

This command is included for compatibility only and has no effect other than returning an OK result code.
Syntax

&G[<value>] n = 0 - 2.

Defined Values

<value> Decimal number corresponding to the selected option.

0 Included for compatibility only and has no effect other than returning an OK result code.

(Default.)
1 Included for compatibility only and has no effect other than returning an OK result code.
2 Included for compatibility only and has no effect other than returning an OK result code.

Result Code

OK <value> = 0 to 2.
ERROR Otherwise.

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3.2.3.10 &P - Select Pulse Dial Make/Break Ratio

This command determines the make/break ratio used during pulse dialing. It is only effective if the appropriate bit to enable
this command is set through the .INF File. If enabled, it will override the make/break ratios in the OEM parameters in the .INF
File. The default is country-dependent.

Syntax

&P[<value>]

Defined Values

<value> Decimal number corresponding to the selected information.

0 Selects 39%-61% make/break ratio at 10 pulses per second. (Default.)
1 Selects 33%-67% make/break ratio at 10 pulses per second.
2 Selects 39%-61% make/break ratio at 20 pulses per second.
3 Selects 33%-67% make/break ratio at 20 pulses per second.

Result Codes

OK <value> = 0 to 3.
ERROR Otherwise.

3.2.3.11 &V - Display Current Configuration and Stored Profile

This command reports the current (active) configuration and the stored (user) profiles.
Syntax

&V

Result Code

OK

Example:

AT&V
ACTIVE PROFILE:
E1 L1 M1 Q0 T V1 X0 &C1 &D2 &G0 &T0
S00:000 S01:000 S02:043 S03:013 S04:010 S05:008 S06:004 S07:050 S08:004
S10:014 S12:050 S16:000 S18:000 S29:070

STORED PROFILE 0:
E1 L1 M1 Q0 T V1 X4 &C1 &D2 &G0 &T0
S00:000 S02:043 S06:004 S07:050 S08:004 S10:014 S12:050 S18:000 S29:070

OK

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3.2.3.12 &W - Store Current Configuration

This command saves the current (active) configuration (profile), including S-Parameters, in the Registry. The current
configuration is comprised of a list of storable parameters illustrated in the &V command. These settings are restored to the
active configuration upon receiving an Z command or at power up.

Syntax

&W

Result Code

OK

3.2.3.13 *B - Display Blacklisted Numbers

This command requests the modem to return a list of blacklisted numbers to the DTE. The format of the response is shown by
the example below. Permanently forbidden numbers as defined by country requirements will not appear on this list. If no
numbers are blacklisted, only the OK result code is issued.

Example:

NO. - PHONE NUMBER -

------ ------------------------------

1; 4175537660

2; 8288924961

3; 3887278862

4; 3124839442

5; 6284664

OK

3.2.3.14 *D - Display Delayed Numbers

This command causes the modem to send a list of the delayed numbers together with the delay associated with each. The
modem will return a list of delayed telephone numbers as defined in the *B command. The format of the response is shown by
the example below (delay times are shown as hours:minutes:seconds). If no numbers are delayed, only the OK result code is
issued.

Example:

NO. - PHONE NUMBER -DELAY

------ -------------------------------------------

1; 8264734660 2:00:00

2; 7532634661 2:00:00

3; 2587334662 0:02:00

4; 7532651663 0:03:25

5; 7459931664 0:01:45

OK

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3.2.4 Modulation Control Commands

3.2.4.1 +MS - Modulation Selection

This extended-format compound parameter controls the manner of operation of the modulation capabilities in the modem. It
accepts six subparameters:

Syntax

+MS=[<carrier>[,<automode>[,<min_tx_rate>[,<max_tx_rate>[,<min_rx_rate>[,<max_rx_rate>]]]]]]
Where: Possible <carrier>, <min_tx_rate>, <max_tx_rate>, <min_rx_rate>, and <max_rx_rate values are

listed in are Table 3-1 (see definitions below).

Table 3-1. +MS Command Supported Rates

Modulation <carrier> Possible (<min_rx_rate>, <min_rx_rate>, (<min_tx_rate>), and <max_tx_rate>) Rates (bps)

Bell 103 B103 300
Bell 212 B212 1200 Rx/75 Tx or 75 Rx/1200 Tx
V.21 V21 300
V.22 V22 1200
V.22 bis V22B 2400 or 1200
V.23 V23C 1200Rx/75Tx or 75Rx/1200Tx
V.32 V32 9600 or 4800
V.32 bis V32B 14400, 12000, 9600, 7200, or 4800
V.34 V34 33600, 31200, 28800, 26400, 24000, 21600, 19200, 16800, 14400, 12000, 9600, 7200, 4800, or 2400
K56flex K56 56000, 54000, 52000, 50000, 48000, 46000, 44000, 42000, 40000, 38000, 36000, 34000, 32000
V.90 V90

56000, 54667, 53333, 52000, 50667, 49333, 48000, 46667, 45333, 42667, 41333, 40000, 38667, 37333,
36000, 34667, 33333, 32000, 30667, 29333, 28000

Defined Values

<carrier> A string which specifies the preferred modem carrier to use in originating or answering a connection.

<carrier> values are strings of up to eight characters, consisting only of numeric digits and upper
case letters. <carrier> values for ITU standard modulations take the form: <letter><1-4 digits><other
letters as needed>. Defined values are listed in Table 3-1.

<automode> A numeric value which enables or disables automatic modulation negotiation (e.g., ITU-T V.32

Annex A or V.8).

0 Automode disabled.
1 Automode enabled. (Default.)

<min_rx_rate> and
<max_rx_rate> Numeric values which specify the lowest (<min_rx_rate>) and highest (<max_rx_rate>) rate at which

the modem may establish a receive connection. May be used to condition distinct limits for the
receive direction as distinct from the transmit direction. Values for this subparameter are decimal
encoded, in units of bit/s. The possible values for each modulation are listed in Table 3-1. Actual
values will be limited to possible values corresponding to the entered <carrier> and fall-back
<carrier> as determined during operation. (Default = lowest (<min_rx_rate>) and highest

(<max_rx_rate>) rate supported by the selected carrier.)
<min_tx_rate> and
<max_tx_rate> Numeric values which specify the lowest (<min_tx_rate>) and highest (<max_tx_rate>) rate at which

the modem may establish a transmit connection. Non-zero values for this subparameter are decimal

encoded, in units of bit/s. The possible values for each modulation are listed in Table 3-1. Actual

values will be limited to possible values corresponding to the entered <carrier> and fall-back

<carrier> as determined during operation. (Default = lowest (<min_tx_rate>) and highest

(<max_tx_rate>) rate supported by the selected carrier.)

bis

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Reporting Current or Selected Values
Command: +MS?

Response: +MS: <carrier>,<automode>,<min_tx_rate>,<max_tx_rate>,<min_rx_rate>,<max_rx_rate>

The current active settings are reported under control of the +MR parameter.

Note:

Example: +MS: K56, 1,75,33600,75,56000 For default values. This example allows maximum system flexibility

to determine optimal receive and transmit rates during operation.

Reporting Supported Range of Parameter Values
Command: +MS=?

Response: +MS: (< carrier> range),(<automode> range),(<min_tx_rate> range),(<max_tx_rate> range),

(<min_rx_rate> range), (<max_rx_rate> range)

Example: +MS: (B103,B212,V21,V22,V22B,V23C,V32,V32B,V34,K56,V90),(0,1),(75-33600),(75-33600),

(75-56000),(75-56000)

Result Code

OK Valid subparameter string
ERROR Otherwise.

3.2.4.2 +MR - Modulation Reporting Control

This extended-format numeric parameter controls whether or not the extended-format +MCR: <carrier> and +MRR: <rate>
intermediate result codes are transmitted from the modem to the DTE (see Section 3.5 and Table 3-14). If enabled, +MCR:
<carrier> and +MRR: <rate> intermediate result codes represent the current (negotiated or renegotiated) modulation <carrier>
and <rate> that are transmitted at the point during connect negotiation (handshaking) at which the modem has determined
which modulation and rate will be used, i.e., before any Error Control or Data Compression reports are transmitted, and
before any final result code (e.g., CONNECT) is transmitted.

S95 bit 2 is reset to 0 for +MR=0 and is set to a 1 for +MR=1 or +MR=2. The more recent setting of +MR or S95 bit 2, and the
W command setting, determines modulation result code reporting (see S95 Parameter and W Command).

Syntax

+MR=[<value>]

Defined Values

<value> A decimal number corresponding to the selected option:

0 Disables reporting of modulation connection (+MCR: and +MRR: are not transmitted).
1 Enables reporting of modulation connection (+MCR: and +MRR: are transmitted).

(Default.)

2 Enables reporting of modulation connection (+MCR: and Receive Rate Only: are

transmitted).

Reporting Current or Selected Values
Command: +MR?

Response: +MR: <current value>
Example: +MR: 1 For default setting

Reporting Supported Range of Parameter Values
Command: +MR=?

Response: +MR: (<value>range)
Example: +MR: (0,1,2)

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+MCR: Report Syntax
Response: +MCR: <carrier>

<carrier> Alphanumeric code corresponding to the reported carrier. Defined values are:

B103 For Bell 103
B212 For Bell 212
V21 For V.21
V22 For V.22
V22B For V.22bis
V23C For V.23
V32 For V.32
V32B For V.32bis
V34 For V.34
V90 For V.90
K56 For K56flex

+MRR: Report Syntax
Response: +MRR: <tx_rate>,<rx_rate>

<tx_rate> Decimal transmit rate in bits/s.
<rx_rate> Decimal receive rate in bits/s.

Example: +MRR: 28800, 48000

3.2.4.3 %E - Enable/Disable Line Quality Monitor, Auto-Retrain, and Auto-Rate Renegotiation

This command controls whether or not the modem will automatically monitor the line quality and request a retrain (%E1) or a
rate renegotiation when line quality merits a change. If enabled, the modem attempts to retrain for a maximum of 30 seconds.

Syntax

%E[<value>]

Defined Values

<value> A decimal number corresponding to the selected option:

0 Disable line quality monitor, auto-retrain, and auto-rate renegotiation.
1 Enable line quality monitor, auto-retrain, and auto-rate renegotiation. (Default.)

Result Code

OK <value> = 0 and 1
ERROR Otherwise.

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3.2.5 Error Control Commands

This section describes parameters used to select and operate the modem in V.42 LAPM or MNP error control mode, Normal
(Buffered) Mode, or V.80 Synchronous Access Mode.

3.2.5.1 +ES - Error Control and Synchronous Mode Selection

This extended-format command specifies the initial requested mode of operation when the modem is operating as the
originator, optionally specifies the acceptable fallback mode of operation when the modem is operating as the originator, and
optionally specifies the acceptable fallback mode of operation when the modem is operating as the answerer. It accepts three
numeric subparameters:

Syntax

+ES=[<orig_rqst>[,<orig_fbk>[,<ans_fbk>]]]

Defined Values

<orig_rqst> Decimal number which specifies the initial requested mode of operation when the modem is

operating as the originator. The options are:

0 Initiate call with Direct Mode.
1 Initiate call with Normal Mode (also referred to as Buffered Mode or Direct Mode) only.
2 Initiate V.42 without Detection Phase. If V.8 is in use, disable V.42 Detection Phase.
3 Initiate V.42 with Detection Phase. (Default.)
4 Initiate MNP.
6 Initiate V.80 Synchronous Access Mode when connection is completed, and Data State

is entered. (See +ESA and +ITF commands.)

<orig_fbk> Decimal number which specifies the acceptable fallback mode of operation when the modem is

operating as the originator.

0 LAPM, MNP, or Normal Mode error control optional. (Default.)
1 LAPM, MNP, or Direct Mode error control optional.
2 LAPM or MNP error control required; disconnect if error control is not established.
3 LAPM error control required; disconnect if error control is not established.
4 MNP error control required; disconnect if error control is not established.

<ans_fbk> Decimal number which specifies the acceptable fallback mode of operation when the modem is

operating as the answerer or specifies V.80 Synchronous Access Mode.

1 Error control disabled, use Normal Mode.
2 LAPM, MNP, or Normal Mode error control optional. (Default.)
3 LAPM, MNP, or Direct Mode error control optional.
4 LAPM or MNP error control required; disconnect if error control is not established.
5 LAPM error control required; disconnect if error control is not established.
6 MNP error control required; disconnect if error control is not established.
8 Initiate V.80 Synchronous Access Mode when connection is completed, and Data State

is entered (see +ESA and +ITF commands).

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Examples

+ES=6 Enable V.80 Synchronous Access Mode originator
+ES=,,8 Enable V.80 Synchronous Access Mode answerer
+ES=6,,8 Enable V.80 Synchronous Access Mode originator and answerer
+ES=3 Enable V.42 with Detection Phase originator. Disable V.80 Synchronous Access Mode originator.
+ES=,,2 Allow LAPM, MNP, or Normal Mode connection answerer. Disable V.80 Synchronous Access Mode

answerer.

+ES=3,,2 Enable V.42 with Detection Phase originator, allow LAPM, MNP, or Normal Mode connection

answer. Disable Synchronous Access Mode originator and answerer.

Reporting Current or Selected Values
Command: +ES?

Response: +ES: <orig_rqst>,<orig_fbk>,<ans_fbk>
Example: +ES: 3,0,2 For default settings.

+ES: 6,0,8 For V.80 Synchronous Access Mode originator and answerer.

Reporting Supported Range of Parameter Values
Command: +ES=?

Response: +ES: (<orig_rqst> range),( <orig_fbk> range), (<ans_fbk> range)
Example: +ES: (0-4,6),(0-4),(0-6,8)

3.2.5.2 +EB - Break Handling in Error Control Operation

This extended-format compound parameter controls the break handling in V.42 operation. It accepts three numeric
subparameters:

Syntax

+EB=[<break_selection>[,<timed>[,<default_length>]]]

Defined Values

<break_selection> Decimal number 0 specifying that break is to be ignored, i.e., not signaled to remote DCE.
<timed> Decimal number 0 specifying that any transmitted V.42 L-SIGNAL will not indicate break signal

length
<default_length> Decimal number 0 specifying that break is not delivered to the DTE.

Reporting Current or Selected Values
Command: +EB?

Response: +EB: <break_selection>,<timed>,<default_length><CR>
Example: +EB: 0,0,0 For default settings.

Reporting Supported Range of Parameter Values
Command: +EB=?

Response: +EB: (<break_selection> range),(<timed> range), (default_length> range)
Example: +EB: (0),(0),(0)

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3.2.5.3 +ESR - Selective Repeat

This extended-format numeric parameter controls the use of the selective repeat (SREJ) option in V.42.
Syntax

+ESR=[<value>] Decimal number 0 specifying that SREJ is not used.

Example:

+ESR: (0) For default settings.

3.2.5.4 +EFCS - 32-bit Frame Check Sequence

This extended-format numeric parameter controls the use of the 16-bit or 32-bit frame check sequence (FCS) option in V.42.
Syntax

+EFCS=[<value>]

Defined Values

<value> Decimal number 0 specifying the use of the 16-bit FCS specified in V.42.

Reporting Current or Selected Values
Command: +EFCS?

Response: +EFCS: <value>
Example: +EFCS: 0 For default setting.

Reporting Supported Range of Parameter Values
Command: +EFCS=?

Response: +EFCS: (<value> range)
Example: +EFCS: (0)

3.2.5.5 +ER - Error Control Reporting

This extended-format numeric parameter controls whether or not the extended-format "+ER: " intermediate result code is
transmitted from the modem to the DTE (see Section 3.5 and Table 3-14).

S95 bit 3 is reset to 0 for +ER=0 and is set to a 1 for +ER=1. The more recent setting of +ER or S95 bit 3, and the W
command setting, determines the actual error control result code reporting (see S95 Parameter and W Command).

+ER=[<value>]

Syntax

+ER=[<value>]

Defined Values

<value> A decimal number corresponding to the selected error control option:

0 Error control reporting disabled (no +ER intermediate result code transmitted).
1 Error control reporting enabled (+ER intermediate result code transmitted). (Default.)

Reporting Current or Selected Values
Command: +ER?

Response: +ER: <current value>
Example: +ER: 1 for the default setting

Reporting Supported Range of Parameter Values
Command: +ER=?

Response: +ER: (<value> range)
Example: +ER: (0,1)

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+ER: <type>

The +ER: <type> reported represents the current (negotiated or renegotiated) modem-modem error control type. If enabled,
the intermediate result code is transmitted at the point during error control negotiation (handshaking) at which the modem has
determined which error control protocol will be used (if any), before the final result code (e.g., CONNECT) is transmitted.

The +ER intermediate result code, if enabled, is issued after the Modulation report (+MCR and +MRR) and before the Data
Compression Report (+DR).

Syntax

+ER: <type>

Defined Values

<type> An alphanumeric code corresponding to the selected protocol.

NONE Error control is not in use.
LAPM V.42 LAPM protocol is in use.
ALT MNP is in use.

Example

+ER: LAPM

3.2.5.6 +ETBM - Call Termination Buffer Management

This extended-format compound parameter controls the handling of data remaining in modem buffers upon call termination. It
accepts three numeric subparameters:

Syntax

+ETBM=[<pending_TD>[,<pending_RD>[,<timer>]]]

Defined Values

<pending_TD> Decimal number 0 specifying that disconnect will occur immediately and all buffered transmit data

will be discarded when the local DTE requests call disconnection.
<pending_RD> Decimal number 0 specifying that disconnect will occur immediately and all buffered receive data will

be discarded when the local DTE requests call disconnection.
<timer> Decimal number 0 specifying that the modem will not attempt to deliver the buffered data before

abandoning the attempt and discarding remaining data.

Reporting Current or Selected Values
Command: +ETBM?

Response: +ETBM: <pending_TD>,<pending_RD>,<timer>
Example: +ETBM: 0,0,0

Reporting Supported Range of Parameter Values
Command: +ETBM=?

Response: +ETBM: (<pending_TD> range),(<pending_RD> range), (<timer> range)
Example: +ETBM: (0),(0),(0)

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3.2.6 Data Compression Commands

This section contains parameters to condition modem use of standard ITU-T V.42

3.2.6.1 +DS - Data Compression

This extended-format compound parameter controls the V.42bis data compression function if provided in the modem. It
accepts four numeric subparameters:

Syntax

+DS=[<direction>[,<compr_neg>[,<max_dict>[,<max_string>]]]]

Defined Values

<direction> Specifies the desired direction(s) of operation of the data compression function; from the DTE point

of view.

0 Negotiated; no compression (V.42bis P0=0).
3 both directions, accept any direction (V.42bis P0=11). (Default.)

<compr_neg> Specifies whether or not the modem should continue to operate if the desired result is not obtained.

0 Do not disconnect if V.42bis is not negotiated by the remote modem as specified in

<direction>.

<max_dict> Specifies the maximum number of dictionary entries (2048 entries) which should be negotiated (may

be used by the DTE to limit the codeword size transmitted, based on its knowledge of the nature of

the data to be transmitted).

Data Compression Procedures.

bis

<max_string> Specifies the maximum string length (32 bytes) to be negotiated (V.42bis P2).

Reporting Current or Selected Values
Command: +DS?

Response: +DS: <direction>,<compr_neg>,<max_dict>,<max_string>
Example: +DS: 3,0,2048,32 for the defaults and 2048 entry max dictionary.

Reporting Supported Range of Parameter Values
Command: +DS=?

Response: +DS: (<direction> range),(< compr_neg > range),(<max_dict> range),(<max_string> range)
Example: +DS: (0,3),(0),(2048),(32)

3.2.6.2 +DR - Data Compression Reporting

This extended-format numeric parameter controls whether or not the extended-format "+DR: " intermediate result code is
transmitted from the modem to the DTE (see Section 3.5 and Table 3-14).

S95 bit 5 is reset to 0 for +DR=0 and is set to a 1 for +DR=1. The more recent setting of +DR or S95 bit 5, and the W
command setting, determines the actual data compression result code reporting (see S95 Parameter and W Command).

Syntax
+DR=[<value>]

Defined Values

<value> decimal number corresponding to the selected option:

0 Data compression reporting disabled (no +DR result code transmitted).
1 Data compression reporting enabled (+DR result code transmitted). (Default.)

Reporting Current or Selected Values
Command: +DR?

Response: +DR: <current value>
Example: +DR: 1 For the default setting.

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Reporting Supported Range of Parameter Values
Command: +DR=?

Response: +DR: (<value> range)
Example: +DR: (0,1)

+DR: <type> Intermediate Result Code
The +DR: <type> reported represents the current (negotiated or renegotiated) modem-modem data compression type. If

enabled, the intermediate result code is transmitted at the point after error control negotiation (handshaking) at which the
modem has determined which data compression technique will be used (if any) and the direction of operation. The +DR
intermediate result code, if enabled, is issued after the Error Control Report (+ER) and before the final result code (e.g.,
CONNECT).

The format of this result code is:
Result Code Syntax

+DR: <type>

Defined Values

<type> An alphanumeric code corresponding to the selected option:

NONE Data compression is not in use.
V42B V.42bis is in use in both directions.
ALT MNP 5 compression.

Example

+DR: V42B

3.2.6.3 %C - Enable/Disable Data Compression

Enables or disables data compression negotiation. The modem can only perform data compression on an error corrected link.
Syntax

%C[<value>]

Defined Values

<value> A decimal number corresponding to the selected option:

0 Disables data compression.
1 Enables both V.42 bis and MNP 5 data compression.
2 Enables both V.42 bis and MNP 5 data compression.
3 Enables both V.42 bis and MNP 5 data compression. (Default.)

Result Codes:

OK <value> = 0, 1, 2, or 3.
ERROR Otherwise.

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3.2.6.4 N - Automode Enable

This command is included for compatibility only and has no effect other than returning a result code. The only valid values are
0-1.

Syntax

N[<mode>]

Defined Values

<mode > Decimal number corresponding to the selected value: 0-1.

Result Codes

OK <mode> = 0 to 1.
ERROR Otherwise.

3.2.7 V.8/V.8bis Commands

3.2.7.1 +A8E - V.8 and V.8bis Operation Controls

This command is defined for two conditions: as a parameter while the modem is on-hook, and as an action command while
the modem is off-hook. If enabled, V.8 negotiation does not preclude simultaneous implementation of other negotiation
means (e.g., V.8bis, V.18, V.32bis Annex A).

This command is a compound parameter if issued while the modem is on-hook, used to precondition V.8 and V.8bis
originating and answering operation. It is issued by the DTE before the Dial (D) or Answer (A) command, regardless of the
state of the +FCLASS parameter.

This command is an action command if issued while the modem is off-hook, to (re)start V.8 or V.8bis negotiation. For
example, if initial V.8 negotiation failed, but subsequent T.30 negotiation indicated V.8 capability, this command may be used
to initiate V.8 negotiation.

Syntax

+A8E=<v8o>,<v8a>,<v8cf>[,<v8b>][,<cfrange>][,<protrange>]

Defined Values

<v8o> Decimal number which enables/disables issuance of +A8x indications during modem-controlled V.8

origination negotiation

1 Enable DCE-controlled V.8 origination negotiation without +A8x indications.

(Default.)

6 Enable DCE-controlled V.8 origination negotiation with +A8

<v8a>= Decimal number which enables/disables issuance of +A8x indications during modem-controlled V.8

answer negotiation.

1 Enable DCE-controlled V.8 answer negotiation without +A8x indications. (Default.)

5 Enable DCE-controlled V.8 answer negotiation with +A8x indications.
<v8cf>= Set the V.8 CI signal call function to the hexadecimal octet value X.
<v8b>= Decimal number which enables/disables V.8bis negotiation.

0 Disable V.8bis negotiation. (Default.)

1 Enable DCE-controlled V.8bis negotiation.

indications.

x

2 Enable DTE-controlled V.8bis negotiation.
<cfrange>= “<string of values>“. Applicable only for <v8a>=5 (not supported).
< protrange >= “<string of values>“. Applicable only for <v8a>=5 (not supported).

Default values: 1,1,,1,"",""

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The ATD and ATA commands behave as specified in §6.3.1/V.25ter and §6.3.5/V.25ter, respectively, and +A8n indications
are not generated by the modem.

For subparameter values <v8o>=6 and <v8a>=5, the +A8I, +A8C, +A8A, +A8J, and +A8M indications are issued during the
course of the V.8 session to notify the DTE when the relevant V.8 signals are received. The modem controls the V.8 session,
however, and the +A8M command is not used.

Reporting Current or Selected Values
Command: +A8E?

Response: +A8E: <v8o>,<v8a>,<v8cf>[,<v8b>][,<cfrange>][,<protrange>]
Example: +A8E: 1,1,,1,"","" For the defaults

Reporting Supported Range of Parameter Values
Command: +A8E=?

Response: +A8E: (<v8o> range),(<v8a> range), (maximum size of v8cf in octets), (<v8b> range),(<cfrange> option bit

range),(<protrange> option bit range)

Example: +A8E: (1,6),(1,5),(1),(0),(1,6),(1)

3.2.7.2 +A8M - Send V.8 Menu Signals

This command, applicable only in DTE-controlled V.8, directs the modem to send a V.8 CM or JM signal using the specified
hexadecimal coded string. If the modem can decode the menu octet string, and if it cannot implement a specified feature, the
modem reports an ERROR final result code, but stays in V.8 operation awaiting another command.

Syntax

+A8M=<hexadecimal coded CM or JM octet string>

3.2.7.3 +A8I: - CI Signal Indication

This indication is issued by an answering modem, if +A8E,<v8a> ≠ 0, to indicate detection of a V.8 CI signal, and report the
recovered Call Function octet(s).

Indication Syntax

+A8I:<v8cf><CR>

Defined Values

<v8cf> A hexadecimal code octet representation of those Call Function octet(s). +A8I:0 indicates that the

modem timed out waiting for CI.

Example

+A8I:0 The modem timed out waiting for CI.
+A8I:X YYY

3-34

Conexant

1118

Command Reference Manual

3.2.7.4 +A8C: - Calling Tone Indication

This indication is issued by an answering modem, if +A8E,<v8a> ≠ 0, to indicate detection of 1100 Hz or 1300 Hz calling
tones, or sigC signals, as defined in T.30, V.8 and in V.25.

Indication Syntax

+A8C: <type><CR>

Defined Values

<type> Decimal number which indicates the corresponding detected calling tone.

0 The modem concluded answer tone transmission without reporting detection of any

calling tone.
1 CNG tone (1100 Hz) detected.
2 1300 Hz V.25 data modem calling tone detected.
3 sigC signal: V.32/V.32

Example

+A8C: 1 For CNG tone detected.

3.2.7.5 +A8A: - Answer Signal Indication

This indication is issued by a calling modem, if +A8E <v8o> ≠ 0, to indicate detection of an answering signal.
Indication Syntax

+A8A:<type><CR>

Defined Values

<type><CR> Decimal number which indicates the corresponding detected answer signal.

0 The modem timed out waiting for an answering signal.
1 V.8 ANSam signal (2100 Hz with amplitude modulation) detected.
2 V.25 answer tone (2100 Hz) detected.
3 V.25 answer tone with phase reversals detected. (Note)
4 sigA signal: V.21 Ch2 with flags (e.g., T.30 control preamble) detected.
5 sigA signal: V.22bis USB1 signal detected.
6 sigA signal: V.32bis AC signal detected.
7 sigA signal: V.34 ToneA signal detected.

Example

+A8A:1 For V.8 ANSam signal (2100 Hz with amplitude modulation) detected.

AA tone detected.

bis

1118

Conexant

3-35

Command Reference Manual

3.2.7.6 +A8J: - V.8 Negotiation Complete

This indication is issued by either modem when the negotiation is complete and CJ is sent or detected. An answering modem
will issue this on detection of CJ from the remote terminal. A calling modem will send a CJ signal to the remote terminal at the
same time as a +A8J indication. +A8J:1 indicates CJ; +A8J:0 indicates that the modem timed out waiting for a CJ signal.

Indication Syntax

+A8J:<value><CR>

Defined Values

<value> Decimal number corresponding to the selected option.

0 The modem timed out waiting for a CJ signal.
1 CJ signal sent or detected.

Example

+A8J:1 For CJ sent to a remote terminal.

3.2.7.7 +A8M: - V.8 Menu Report

This indication is issued by either modem, during V.8 negotiation, to indicate the contents of a valid received CM or JM signal.
A +A8M:0 indicates that the modem timed out waiting for a CM or JM signal.

Report Syntax

+A8M:< hex_string>

Defined Values

< hex_string> CM or JM hexadecimal coded string. A +A8M:0 indicates that the modem timed out waiting for a CM

or JM signal.

Example

A8M:XXX YYY

3.2.7.8 +A8R: - V.8bis Signal and Message Reporting

If enabled by +A8E=,,,[<v8b>=2] command, the modem monitors for V.8
intermediate result code response to report that signal. Two concatenated V.8
consecutive <message> indications.

Report Syntax

+A8R:<signal>[,[<1st message>]][,<2nd message>]<CR>

Defined Values

<signal> The V.8

are not reported, i.e., the modem is not expected to discern the power level of received CRe and
MRd signals. If a V.8
reported as a 0 <signal> value.

<1st message> The contents of valid V.8

string(s) (A.4.1). Flag detection and consumption, flag transparency 0-bit deletion and FCS checking
are performed by the modem. The modem does not report invalid messages (e.g., bad FCS). If two
consecutive messages are detected but the first is invalid, the modem indicates this with no
characters between the first and second comma (e.g., +A8R:<signal>,,<2nd message>).

signal, if detected, is indicated using a <signal> value (see Table 3-2). Values of 4 and 8

bis

message is detected without a preceding V.8

bis

message(s), if detected, are reported using hexadecimal octet coded

bis

signals and messages, and uses the +A8R:

bis

messages are reported with two

bis

signal, the preamble is

bis

<2nd message See <1st message>.

Example

+A8R:0,XX,YY For a V.8
+A8R:0,XX,YY For a V.8

3-36

bis
bis

message detected without a preceding V.8
message detected with a preceding V.8

bis

Conexant

signal.

bis

signal.

1118

Command Reference Manual

Table 3-2. V.8/V.8bis Example Commands/Responses for Originator and Answerer

2ULJLQDWRU $QVZHUHU

6FHQDULR '7( &RPPDQG 0RGHP 5HVSRQVH RU ,QGLFDWLRQ '7( &RPPDQG 0RGHP $QVZHUHU 5HVSRQVH RU

,QGLFDWLRQ

 $7)6 FU! $7)6 FU!FU!OI!2.FU!OI! $7)6 FU! $7)6 FU!FU!OI!2.FU!OI!

$7'7FU! $7'7FU! FU!OI!5,1*FU!OI!

FU!OI!&211(&7 FU!OI! FU!OI!&211(&7 FU!OI!

 $7)6 FU! $7)6 FU!FU!OI!2.FU!OI $7)6 FU! $7)6 FU!FU!OI!2.FU!OI!

$7$( FU! $7$( FU!FU!OI!2.FU!OI!

$7'7FU! $7'7FU! FU!OI!5,1*FU!OI!

FU!OI!&211(&7 FU!OI! FU!OI!$, FU!OI!

FU!OI!$0 &FU!OI!
FU!OI!$- FU!OI!
FU!OI!&211(&7 FU!OI!

 $7)6 FU! $7)6 FU! $7)6 FU! $7)6 FU!FU!OI!2.FU!OI!

$7$( FU! $7$( FU!FU!OI!2.FU!OI!
$7'7FU! $7'7FU! FU!OI!5,1*FU!OI!

FU!OI!$$ FU!OI!
FU!OI!$0 &FU!OI!
FU!OI!$- FU!OI!
FU!OI!&211(&7 FU!OI! FU!OI!&211(&7 FU!OI!

 $7)6 FU! $7)6 FU! $7)6 FU! $7)6 FU!

$7$( FU! $7$( FU!FU!OI!2.FU!OI! $7$( FU! $7$( FU!FU!OI!2.FU!OI!
$7'7FU! $7'7FU! FU!OI!5,1*FU!OI!

FU!OI!$$ FU!OI! FU!OI!$, &FU!OI!
FU!OI!$0 &FU!OI! FU!OI!$0 &FU!OI!
FU!OI!$- FU!OI! FU!OI!$- FU!OI!
FU!OI!&211(&7 FU!OI! FU!OI!&211(&7 FU!OI!

 $7)6 FU! $7)6 FU! $7)6 FU! $7)6 FU!

$7$( FU! $7$( FU!FU!OI!2.FU!OI! $7$( FU! $7$( FU!FU!OI!2.FU!OI!
$7'7FU! $7'7FU! FU!OI!5,1*FU!OI!

FU!OI!$$ FU!OI! FU!OI!$, FU!OI!
FU!OI!$0 &FU!OI! FU!OI!$0 FU!OI!
FU!OI!$- FU!OI! FU!OI!$- FU!OI!
FU!OI!12 &$55,(5FU!OI! FU!OI!12 &$55,(5FU!OI!

 $7)6 FU! $7)6 FU! $7)6 FU! $7)6 FU!

$7$( FU! $7$( FU!FU!OI!2.FU!OI! $7$( FU! $7$( FU!FU!OI!2.FU!OI!
$7'7FU! $7'7FU! FU!OI!5,1*FU!OI!

FU!OI!$$ FU!OI! FU!OI!$, FU!OI!
FU!OI!$0 FU!OI! FU!OI!$0 FU!OI!
FU!OI!$- FU!OI! FU!OI!$- FU!OI!
FU!OI!&211(&7 FU!OI! FU!OI!&211(&7 FU!OI!

 $7)6 FU! $7)6 FU! $7)6 FU! $7)6 FU!

$7$( FU! $7$( FU!FU!OI!2.FU!OI! $7$( FU! $7$( FU!FU!OI!2.FU!OI!
$7'7FU! $7'7FU! FU!OI!5,1*FU!OI!

FU!OI!$$ FU!OI! FU!OI!$, FU!OI!
FU!OI!$0 FU!OI! FU!OI!$0 FU!OI!
FU!OI!$- FU!OI! FU!OI!$- FU!OI!
FU!OI!&211(&7 FU!OI! FU!OI!&211(&7 FU!OI!

1118

Conexant

3-37

Command Reference Manual

Table 3-2. V.8/V.8bis Example Commands/Responses for Originator and Answerer (Cont’d)

2ULJLQDWRU $QVZHUHU

6FHQDULR '7( &RPPDQG 0RGHP 5HVSRQVH RU ,QGLFDWLRQ '7( &RPPDQG 0RGHP $QVZHUHU 5HVSRQVH RU

,QGLFDWLRQ

 2ULJLQDWLQJ 0RGHP WKDW 6HQGV D 3URWRFRO 2FWHW WKDW LQGLFDWHV

/$30

 2ULJLQDWLQJ 0RGHP WKDW 6HQGV D 3URWRFRO 2FWHW WKDW LQGLFDWHV

/$30

$7)6 FU! $7)6 FU!

$7$( FU! $7$( FU!FU!OI!2.FU!OI!

FU!OI!5,1*FU!OI!
FU!OI!$, &FU!OI!
FU!OI!$0 &FU!OI!
FU!OI!$- FU!OI!
FU!OI!12 &$55,(5FU!OI!

$7)6 FU! $7)6 FU!

$7$( FU! $7$( FU!FU!OI!2.FU!OI!

FU!OI!5,1*FU!OI!
FU!OI!$, &FU!OI!
FU!OI!$0 &FU!OI!
FU!OI!$- FU!OI!
FU!OI!&211(&7 FU!OI!

3-38

Conexant

1118

Command Reference Manual

3.2.8 Synchronous Access Mode Commands

3.2.8.1 +ESA - Configure Synchronous Access Mode

This extended-format compound parameter controls the manner of operation of the Synchronous Access Mode in the
modem.

Enabling Synchronous Access Mode enables the use of the 8-bit command characters defined in Table 9/V.80 of the Draft
ITU-T Recommendation V.80 (DATA COMMUNICATION OVER THE TELEPHONE NETWORK; In-Band modem Control and
Synchronous Data Modes for Asynchronous DTE).

Syntax

+ESA=[<trans_idle>[,<framed_idle>[,<framed_un_ov>[,<hd_auto>[,<crc_type>[,<nrzi_en>[,<syn1>[,<syn2>]]]]]]]]

Defined Values

<trans_idle> Decimal number which specifies the bit sequence transmitted by the modem when a transmit data

buffer underrun condition occurs, while operating in Transparent sub-Mode. The options are:

0 In Transparent sub-Mode, modem transmits 8-bit SYN sequence on idle. Modem

receiver does not hunt for synchronization sequence (default and fixed).

<framed_idle> Decimal number which specifies the bit sequence transmitted by the modem when a transmit data

buffer underrun condition occurs immediately after a flag, while operating in Framed sub-Mode. The
options are:

0 In Framed sub-Mode, modem transmits HDLC flags on idle (default and fixed).

<framed_un_ov> Decimal number which specifies the actions undertaken by the modem when a transmit data buffer

underrun or overrun condition occurs immediately after a non-flag octet, while operating in Framed
sub-Mode.

0 In Framed sub-Mode, modem transmits abort on underrun in middle of frame. (Default.)
1 In Framed sub-Mode, modem transmits a flag on underrun in middle of frame, and

notifies DTE of underrun or overrun.

<hd_auto> Decimal number which specifies whether or not, in V.34 half-duplex operation, additional procedures

besides those specified in § 12/V.34 will be performed by the modem when switching from primary
channel to secondary channel operation, and vice versa. This subparameter should not be
commanded.

<crc_type> Decimal number which specifies the CRC polynomial used while operating in Framed sub-Mode. The

options are:

0 CRC generation and checking disabled. (Default and fixed.)

<nrzi_en> Decimal number which specifies if Non Return to Zero Inverted (NRZI) encoding is to be used by the

modem for transmit and receive data. The options are:

0 NZRI encoding and decoding disabled (default and fixed).

<syn1>, <syn2> Decimal number which specifies the octet value(s) to be used while performing character-oriented

framing. <syn1> is to be commanded to 255 (FFh); <syn2> is not to be commanded.

Reporting Current or Selected Values
Command: +ESA?

Response: +ESA: <trans_idle>,<framed_idle>,<framed_un_ov>,<hd_auto>,<crc_type>,<nrzi_en>,<syn1>,<syn2>
Example: +ESA: 0,0,0,,0,0,255, For the defaults.

1118

Conexant

3-39

Command Reference Manual

Reporting Supported Range of Parameter Values
Command: +ESA=?

Response: +ESA: (<trans_idle> range), (<framed_idle> range),(<framed_un_ov> range), (<hd_auto> range),

(<crc_type> range), (<nrzi_en> range),(<syn1> range), (<syn2> range)

Example: +ESA: (0),(0),(0-1), ,(0),(0),(255)

3.2.8.2 +ITF - Transmit Flow Control Thresholds

In V.80 Synchronous Access Mode, this optional compound parameter allows the DTE to determine the effective input buffer
size in the modem for data on transmit data from the DTE, to control the thresholds used for flow control of such data, and to
control how often the modem reports to the DTE the number of octets in this buffer. Note that the DTE can adjust its own
thresholds for flow control of data on received data from the modem.

Syntax

+ITF=[<off>[,<on>[,<report_period>]]]

Defined Values

<off> Determines the threshold, in octets, above which the modem will generate a flow off signal.

Applicable in Synchronous Access Mode.
The <off> range is 20 -7000. Default <off> value is 128.
For the <on> and <off> subparameters, the input buffer is assumed to reside between the modem’s

V.24 interface and the Synchronous Access protocol layer; i.e., the buffer count includes all octets,
including EM codes, received from the DTE, with the exception of XON and XOFF if these are used
to signal <modem-by-DTE> flow control.

The modem returns the ERROR result code if the DTE specifies that the <off> subparameter be set
to a value less than or equal to the <on> subparameter; in this case, the current parameter value
settings are set to default values.

<on> Determines the threshold, in octets, below which the modem will generate a flow on signal.

Applicable in Synchronous Access Mode.
The <on> range is 10 -5000. Default <on> value is 64.

<report_period> Not supported. A fixed value of zero is used and reported.

Reporting Current or Selected Values
Command: +ITF?

Response: +ITF: <off>,<on>,<report_period>
Example: +ITF: 128,64,0 For default values

Reporting Supported Range of Parameter Values
Command: +ITF=?

Response: +ITF: (<off> range),(<on> range),(<report_period> range)
Example: +ITF: (20-7000),(10-5000),(0)

3-40

Conexant

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Command Reference Manual

3.2.9 Diagnostic and Test Commands

3.2.9.1

#UD –

#UD is an action command requesting reporting of logged operation events. It does not take parameters and must be the last
command in the command line.

The modem logs aspects of their operation for each call, and saves these results until cleared by one of the following events:

1. Power off

2. Hard reset (e.g., negate DTR with &D3 set; reset button)

3. Soft reset = ATZ or AT&F

4. ATD command issued

5. ATA command issued

6. Automatic answer (e.g., set register S0>0 and ring detected)
These results are NOT cleared by changing DTR, V.24 circuit 108.2, if &D0, &D1 or &D2.

Data Call State Model

For purposes of this command, there are four data call states, and associated status issues:

Call Setup

•

−

−

Negotiation

•

−

−

−

−

Data Transfer

•

−

−

−

Call Termination

•

−

−

−

−

Last Call Status Report

Calling DCE: get dial tone, generate dial digits, detect call progress signals.
Answering DCE: detect ringing, detect CallerID, etc.

V.25 calling tone/answer tone exchanges
V.8 or V.8bis call function negotiations
V-series modem carrier detection and training
Modem-to-modem protocols (e.g., V.42, V.42bis).

Bit-error rates, for each direction
Rate renegotiation
Retraining

protocol disconnect signals
carrier disconnect signals
loss of carrier
excessive error rates

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Command Syntax

In response to this command, the modem will report one or more lines of information text as defined below. Information text
format conforms to V.250; each line is preceded by a <CR><LF> pair, and terminated by <CR><LF>. (CR and LF characters
may be changed by writing new values to the contents of registers S3 and S4, respectively.)

The modem may generate a single line or multiple lines, followed by a standard OK final result code. For example, if call
setup failed, only that result is useful. Each information text line is formatted as follows, including one or more key=value
pairs:

Syntax

#UD

Response

DIAG <token key=value [[key=value] [key=value]] …>

Defined Values

DIAG 5 hexadecimal characters (44h, 49h, 41h, 47h, 20h)
< Left angle bracket (less than sign) (3Ch)
token Unique 32-bit hexadecimal string
space space character (20h)
Key One- or two-digit hexadecimal number (see Key in Table 3-3)
= Equal sign (3Dh)
Value Any string as defined below (Table 3-3 - Table 3-8 as appropriate)
> Right angle bracket (greater than sign) (3Eh)

Unless otherwise noted, all values are hexadecimal numbers. Any numeric values from tables in ITU V.58 are converted to
hexadecimal. Multi-digit values are reported MSD first. Leading 0’s may be deleted. See examples in

2A4D3263(

32h, 4h1, 34h, 44h, 33h, 32h, 36h, 33h)

Table 3-12

.

Monitoring an active connection

This command is intended for use after call termination. However, codes are defined so that a modem can respond before the
first call is placed, and during a call for live monitoring purposes. For example, key 60, call termination, has value 1 defined,
indicating that the call is still in progress.

There are at least two ways to do this. First, the DTE could switch the modem to On-Line command state, issue the
command, capture the responses and then issue an ATO command. For smoother on-line monitoring, in-band means defined
in ITU V.80 are recommended if available in the modem. If V.80 methods are used, each response line shall be a separate
extended in-band message.

Notes for Tables

1. The modem may insert a delay (e.g., 10 ms) between information text lines.

2. The code tables include values for data and fax calls. Some of the codes are applicable only to data calls (e.g., data
compression), some are applicable only to call origination (e.g., busy, answering signal detection) and some are
applicable only to the answering modem (e.g., calling signal detection).

callCleared codes from 3.6.4/V.58-1994

callCleared: indicates that the DCE has gone on hook and that the previously existing network connection has been cleared.
These value are hex, converted from decimal in V.58. callCleared codes are described in Table 3-11.

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Table 3-3. AT#UD Last Call Status Report Format

Key Value(s) Definition

0 2 digits Diagnostic Command Specification revi sion number, digit.digit
1 Table 3-4 Call Setup Result code
2 Table 3-5 Multi-media mode
3 Table 3-6 DTE-DCE interface mode
4 String V.8 CM octet string, same format as V.250, in quotes
5 String V.8 JM octet string, same format as V .250, in quotes
10 0-2F Received signal power level, i n –dB m (0-43)
11 0-1F Transmit signal power level, in –dBm (e.g., 0-17)
12 0-64 Estimated noise level , i n –dBm (e.g., 10-90)
17 0-FFF Round Trip delay, in unit s of ms
18 Table 3-7 V.34 INFO bit map
20 Table 3-8 Transmit Carrier Negotiation Res ul t
21 Table 3-8 Receive Carrier Negotiation Result
22 0-1F40 Transmit Carrier symb ol rat e (0-8000) i n symbol/s
23 0-1F40 Receive Carrier symbol rate (0-8000) in symbol/s
24 0-FA0 Transmit Carrier frequency (0-4000) in Hz
25 0-FA0 Receive Carrier f requency (0-4000) in Hz
26 0-FA00 Initial transmit carrier data rate (0-64000) in bit/s
27 0-FA00 Initial receive carrier data rate (0-64000) i n bi t /s
30 0-FF Temporary carrier loss event count
31 0-FF Carrier Rate re-negotiation event count
32 0-FF Carrier Retrains requested
33 0-FF Carrier Retrain requests granted
34 0-FA00 Final transmit carrier data rate in bit/s
35 0-FA00 Final receive carrier data rate in bit/s
40 Table 3-9 Protocol Negotiation Result
41 0-400 Error Control fram e size in bytes
42 0-FF Error control link timeouts i n transmission
43 0-FF Error control link NAKs rece i ved
44 Table 3-10 Compres sion Negotiation Result
50 0-2 Transmit flow control: 0 = off; 1 = DC1/DC3; 2 = V.24 ckt 106/133
51 0-2 Receive flow control: 0 = off; 1 = DC1/DC3; 2 = V.24 ckt 106/133
52 0-FFFFFFFF Transmit characters sent from DTE
53 0-FFFFFFFF Received characters sent to DTE
54 0-FFFF Transmit characters lost (data overrun errors from DTE)
55 0-FFFF Received characters lost (data overrun errors to DTE)
56 0-FFFFFFFF Transmit I- Frame count, if error control protocol running
57 0-FFFFFFFF Received I-Frame count, if error control protocol running
58 0-FFFF Transmit I-Frame error count, if error control protocol running
59 0-FFFF Received I- Frame error count , if error control protocol running
60 Table 3-11 Terminat i on Cause
61 0-FF Call Waiting event count

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Table 3-4. Call Setup Result Codes

Code Definition

0 No previous call (modem log has been cleared since any previous calls)
1 No dial tone detected
2 Reorder signal detected, net work bus y
3 Busy signal detec ted
4 No recognized signal detect ed (e.g., no signal, or nothing recogni zable)
5 Voice detected * if this is a voic e modem (e.g., V.253) operating in voice mode (e.g., +FCLASS=8.0)
7 Data Answering signal detect ed (e.g., V.25 ANS, V.8 A NSam)
8 Data Calling signal detected (e.g. , V.25 CT, V.8 CI)
9 Fax Answering signal detected (e.g. , T.30 CED, DIS)
A Fax Calling signal detected (e.g., T.30 CNG)
B V.8bis signal detected

Table 3-5. Multimedia Modes

Code Definition

0 Data Only
1Fax Only
2Voice
3VoiceView
9 Video-telephony, H.324
A Other V.80 call

Table 3-6. DTE-DCE modes

Code Definition

0 Async data
1 V.80 transparent synchronous mode
2 V.80 framed sync hronous mode

Table 3-7. V.34 INFO bit report

Bits Source bits Definition

31-30 INFO0 bit 20; 0
20-29 INFOc bits 79-88
16-19 INFOc bits 26-29 or 35-38 or 44-47 or 53-56-

or 62-65 or 71-74
12-15 INFOa bits 26-29
10-11 MP bit 50; 0
0-9 INFOa bits 40-49

Pre-emphasis field, selected by the symbol rate chosen

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Table 3-8. gstnModulationSchemeActive from 3.7.2/V.58

Value Description

0 V.17 (G3 Fax call)
1V.21
2V.22
3 V.22bis
4 V.23 Constant Carrier (1200/75)
8 V.27ter (G3 Fax call)
9 V.29 HD (G3 Fax call)
AV.32
B V.32bis
CV.34
EV.90
81
84 Bell 212A
85 Bell 103

Table 3-9. errorControl Active from 3.5.2/V.58

Value Description

0 Disable/none
1 V.42 LAPM
2 V.42 Alternative protocol (MNP™)
80 MNP10™

K56flex



Table 3-10. compressionActive from 3.2.2/V.58

Value Description

0 None
1 V.42bis
80 MNP5™

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Table 3-11. callCleared codes from 3.6.4/V.58-1994

Value Description Notes

0 CauseUnidentified Call setup issues
1 No Previous call Not in V.58
2 Call is still in progress Not in V.58
3 Call Waiting s i gnal detected Not in V.58, only if modem can detect it

4 Delayed Same as value 2A, CallA ttemptsLim i tExceeded
19 InactivityTimerExpired
1F cct108isOffInhibi tsDial DTR low
20 cct108turnedOff DTR drop
29 Blacklist edNumber
2A CallAttemptsLimitExceeded Same as “Delayed”, see ETS 300 001
2B ExtensionP honeOffHook If extension detection supported
2C CallSetupFailTimerExpired e.g., S7 timeout
2D IncomingCallDet ected If incoming call while sending dial command.
2E LoopCurrentInterrupted
2F NoDialTone
31 ReorderTone Fast busy
33 EngagedTone Busy
34 LongSpaceDisconnect And if modem program to abort on l ong space
3C CarrierLost Signal Converter
3D TrainingFailed
3E NoModulationinCommon
3F RetrainFailed
40 RetrainAttemptCountExceeded
41 GstnCleardownReceived
42 FaxDetected If this was not a fax call attempt
46 InTestMode Test
50 AnyKeyAbort Call Control
51 DteHangupCommand If ATH was used to term i nate the previous call.
52 DteResetCommand If ATZ was used to terminat e the previous call.
5A Fram eRej ect Error Control
5B NoErrorControl Established Error control was required
5C ProtocolViolat i on
5D n400exceeded LAPM retransmission Count Timer
5E Negotiat i onFai l ed
5F DisconnectFrameRec ei ved
60 SabmeFrameRecei ved

64 LossOfSynchronization Data Compression

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Example Modem Response and Usage

Example #UD commend response are shown in Table 3-12.

Table 3-12. Completed Data Call, with some errors and rate retrain during the call

Modem Response line Description

DIAG <2A4D3263 0=09> This is version 0.9
DIAG <2A4D3263 1=06 2=0 3=0> Data Answer signal detected; Data only; Charact er async
DIAG <2A4D3263 5=”C14513902A” 6=”A145”> V.8 Cal l Menu indi cates:

V.8 Joint Menu selects :
DIAG <2A4D3263 10=1F 11=0C 12=52> Receive level = -31 dBm; transmit level = -12 dBm ; noise level = -82 dBm
DIAG <2A4D3263 14=03 15=05 16=10> Far end echo delay in milliseconds; Far end echo loss in dB; Near end echo

DIAG <2A4D3263 20=C 22=780 24=0C80 26=79E0> Transmitter: V.34 training completed; V.34 carrier frequency = 1920; V.34

DIAG <2A4D3263 21=D 25=1F40 27=DAC0> Receiver: V. 90 t rai ni ng completed; V.90 symbol rate = 8000; initial receive rat e

DIAG <2A4D3263 30=00 31=03 32=01 33=01> No carrier loss event s, 3 carrier rate renegotiations attempted; 1 carrier retrai n

DIAG <2A4D3263 34=7080 35=CB20> Final transmit rate is 28800 bit /s; final receive rate is 52000 bi t/s
DIAG <2A4D3263 40=1 41=100> LAPM negotiation completed; frame size = 256
DIAG <2A4D3263 42=0 43=0> No error control timeout or li nk NAKs
DIAG <2A4D3263 44=1 45=400> V.42bis data compres sion used; dictionary size = 1024
DIAG <2A4D3263 50=2 51=2> Hardware transmit and receive flow control
DIAG <2A4D3263 52=343CC 54=0> 213964 DTE characters transm i tted, w/o underrun
DIAG <2A4D3263 53=7230E6 55=47> 7483622 DTE characters received, 71 c haracters lost due to receive data

DIAG <2A4D3263 56=29D 58=0001> 597 (decimal) frames transmitted, with 1 frame error
DIAG <2A4D3263 58=2A4B 59=0004> 10827 (decimal) frames received, with 4 frame errors
DIAG <2A4D3263 60=51> Local PC initiated hangup

loss = 16 dB

symbol rate = 3200; initial t ransmit rate is 31200 bit/ s

is 56000 bit/s

requested; 1 carrier retrain granted

overrun

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3.2.9.2 %TT - PTT Test Command

This command facilitates PTT testing of signal levels by providing continuous signals regards of whether or not the modem is
connected to the line. The signal transmitted is in accordance with the parameter provided.

A range of commands allows the user to initiate a series of signals required to obtain PTT approval. The signals emitted
include answer tone, modulation, carriers, and other pertinent signals. A test is initiated upon receipt of a %TTn (the second T
is a password and n is a test number), and the test is aborted when any keyboard character is entered. The modem will
continuously transmit the tone or carrier according to the parameter supplied.

Syntax

%TT0x x corresponds to the desired DTMF dial digit (0, 1, 2, 3, 4, 5, 6, 7, 8, 9, *, #, A, B, C, or D).

0 Dial digit 0
1 Dial digit 1
2 Dial digit 2
3 Dial digit 3
4 Dial digit 4
5 Dial digit 5
6 Dial digit 6
7 Dial digit 7
8 Dial digit 8
9 Dial digit 9
A Dial digit *
B Dial digit #
C Dial digit A
D Dial digit B
E Dial digit C
F Dial digit D

%TT1x x corresponds to the desired FSK mode (V21Ch1, V21Ch2, V23Ch1, V23Ch2, Bell103Ch1, or

Bell103Ch2).

0 V21Ch1
1 V21Ch2
2 V23Ch1
3 V23Ch2
4 Bell103Ch1
5 Bell103Ch2
6-F Reserved

%TT2x x corresponds to the desired QAM mode (V22Org, V22Ans, Bell212Org, Bell212Ans, V22BisOrg,

V22BisAns, V32@4800, V32@7200, V32@9600, V.32Bis@12000, or V32Bis@14400).

0 V22Org
1 V22Ans
2 Bell212Org
3 Bell212Ans
4 V22BisOrg
5 V22BisAns
6 V32@4800
7 V32@7200
8 V32@9600
9 V.32Bis@12000
A V32Bis@14400
B-F Reserved

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%TT3x x corresponds to the selected MISC function (Silence, 2100Hz, 1300Hz, or 1100Hz).

0 Silence
1 2100Hz
2 Reserved
3 1300Hz
4 1100Hz
5-F Reserved

%TT4x x corresponds to the selected FAX mode (V27@2400, V27@4800, V29@7200, V29@9600,

V17@7200LT, V17@7200ST, V17@9600LT,V17@9600ST, V17@12000LT, V17@12000ST,
V17@14400LT, or V17@14400ST).

0 Reserved
1 V27@2400
2 V27@4800
3 V29@7200
4 V29@9600
5 V17@7200LT
6 V17@7200ST
7 V17@9600LT
8 V17@9600ST
9 V17@12000LT
A V17@12000ST
B V17@14400LT
C V17@14400ST
D-F Reserved

%TT5xyz x corresponds to the desired V.34 bit rate (2400, 4800, 7200, 9600, 12000, 14400, 16800, 19200,

21600, 24000, 26400, 28800, 31200, or 33600):

0 2400
1 4800
2 7200
3 9600
4 12000
5 14400
6 16800
7 19200
8 21600
9 24000
A 26400
B 28800
C 31200
D 33600
E-F Reserved

y corresponds to the desired V.34 symbol rate (2400, 2800, 3000, 3200, or 3429).

0 2400 (x ≤ 21600)
1 Reserved
2 2800 (x ≤ 26400)
3 3000 (x ≤ 28800)
4 3200 (x ≤ 31200)
5 3429 (x ≤ 33600)
6-F Reserved

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z = Pre-Emphasis Filter 0...A

0 Pre-Emphasis Filter 0
1 Pre-Emphasis Filter 1
2 Pre-Emphasis Filter 2
3 Pre-Emphasis Filter 3
4 Pre-Emphasis Filter 4
5 Pre-Emphasis Filter 5
6 Pre-Emphasis Filter 6
7 Pre-Emphasis Filter 7
8 Pre-Emphasis Filter 8
9 Pre-Emphasis Filter 9
A Pre-Emphasis Filter A
B-F Reserved

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3.3 S-PARAMETERS

The supported S-Parameters are summarized in Table 3-13.

Table 3-13. S-Parameter Summary

Register Function Units

S0 Number of Rings to Automatic Answer rings
S1 Ring Counter rings
S2 Escape Character ASCII
S3 Line Termination Character ASCII
S4 Response Formatting Character ASCII
S5 Command Line Editing Character ASCII
S6 Wait Time for Dial Tone Before Blind Dialing, or After “W” Dial Modifier s
S7 Wait Time For Carrier After Dial, For Silence, or For Dial Tone After “W” Dial Modifier s
S8 Pause Time for Dial Delay Modifier s
S10 Carrier Loss Disconnect Time 0.1 s
S11 DTMF Tone Duration 0.001 s
S12 Escape Prompt Delay 0.02 s
S18 Test Timer s
S29 Flash Dial Modifier Time 10 ms
S30 Disconnect Inactivity Timer 10 s
S46 Data Compression Control ­S95 Result Code Messages Control -

3.3.1.1 AT=x - Write to Selected S-Parameter

This command writes the value x to the currently selected S-Parameter. An S-Parameter can be selected by using the ATSn
command. All of the S-Parameters will return the OK response if x is a number. Some registers may not be written due to
country specific PTT limitations.

Syntax

S=x

Result Codes

OK For all arguments.

3.3.1.2 AT? - Read Selected S-Parameter

This command reads and displays the selected S-Parameter. An S-Parameter can be selected by using the ATSn command.
Syntax

S=?

Result Codes

OK For all arguments.

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3.3.1.3 Sn - Read/Write S-Parameter

The modem selects an S-Parameter, performs an S-Parameter read or write function, or reports the value of an S-Parameter.

n Establishes S-Parameter n as the last register accessed.
n=v Sets S-Parameter n to the value v.
n? Reports the value of S-Parameter n.

The parameter n can be omitted, in which case the last S-Parameter accessed will be assumed. The S can be omitted for
AT= and AT?, in which case the last S-Parameter accessed will be assumed.

For example:

ATS7 establishes S7 as the last accessed register.
AT=40 sets the contents of the last register accessed to 40.
ATS=20 sets the contents of the last register accessed to 20.

If the number "n" is outside the range of the S-Parameters available, the modem will return the ERROR message. If the value
“v” is outside the range permitted for a given S-Parameter, the modem will return the ERROR message. Input and output are
always in decimal format. Note that some S-Parameters are read-only.

In some cases, writing to the S-Parameter will appear to be accepted but the value will not actually be written.

3.3.2 Factory Defaults

The factory default values are stored in the Registry and are loaded into the active configuration at power up or by the Z
command. In addition, the default profile is subsequently loaded, and may change some of the factory default values.

The default values in the Registry may be loaded at any time by entering the &F command.

3.3.3 S-Parameter Definitions

3.3.3.1 S0 - Number of Rings to Automatic Answer

S0 sets the number of the rings required before the modem automatically answers a call. Setting this parameter to zero
disables auto-answer mode.

Range: 0-255 rings
Default: 0

3.3.3.2 S1 - Ring Counter

S1 is incremented each time the modem detects a ring signal on the telephone line. S1 is cleared if no rings occur over an
eight second interval.

Range: 0-255 rings
Default: 0

3.3.3.3 S2 - Escape Character

S2 holds the decimal value of the ASCII character used as the escape character. The default value corresponds to an ASCII
'+'. A value over 127 disables the escape process, i.e., no escape character will be recognized.

Range: 0-255, ASCII decimal
Default: 43 (+)

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3.3.3.4 S3 - Line Termination Character

S3 sets the decimal value of the command line and result code terminator character. Pertains to asynchronous operation
only.

Range: 0-127, ASCII decimal
Default: 13 (Carriage Return)

3.3.3.5 S4 - Response Formatting Character

S4 sets the decimal value of the character generated by the modem as part of the header, trailer, and terminator for result
codes and information text, along with the S3 parameter (see the description of the V parameter for usage). If the value of S4
is changed in a command line, the result code issued in response to that command line will use the new value of S4.

The Response Formatting character is output after the Line Termination character if verbose result codes are used.

Range: 0-127, ASCII decimal
Default: 10 (Line Feed)

3.3.3.6 S5 - Command Line Editing Character

S5 s sets the decimal value of the character recognized by the modem as a request to delete from the command line the
immediately preceding character. The modem will not recognize the Command Line Editing character if it is set to a value that
is greater than 32 ASCII. This character can be used to edit a command line. When the echo command is enabled, the
modem echoes back to the local DTE the Command Line Editing character, an ASCII space character and a second
Command Line Editing character; this means a total of three characters are transmitted each time the modem processes the
Command Line Editing character.

Range: 0-32, ASCII decimal
Default: 8 (Backspace)

3.3.3.7 S6 - Wait Time for Dial Tone Before Blind Dialing, or After “W” Dial Modifier

S6 sets one of two possible parameters:

1. Sets the length of time, in seconds, that the modem will wait before starting to dial after going off-hook when blind
dialing.

2. If enabled by country options in the INF file, S6 sets the length of time, in seconds, that the modem will wait for dial tone
when encountering a “W” dial modifier before returning NO DIAL TONE result code.

The modem always pauses for a minimum of 2 seconds, even if the value of S6 is less than 2 seconds.

Range: 2-255 seconds
Default: 2

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3.3.3.8 S7 - Wait Time For Carrier After Dial, For Silence, or For Dial Tone After “W” Dial Modifier

S7 sets one of three possible parameters:

1. Sets the length of time, in seconds, that the modem will wait for carrier before hanging up. The timer is started when the
modem finishes dialing (originate), or after the billing delay in answer mode. In originate mode, the timer is reset upon
detection of answer tone if allowed by country restrictions.

2. Sets the length of time, in seconds, that modem will wait for silence when encountering the @ dial modifier before
continuing with the next dial string parameter.

3. If enabled by country options in the INF file, S7 sets the length of time, in seconds, that the modem will wait for dial tone
when encountering a “W” dial modifier before continuing with the next dial string parameter.

Range: 1-255 seconds
Default: 50

3.3.3.9 S8 - Pause Time For Dial Delay

S8 sets the time, in seconds, that the modem must pause when the “,” dial modifier is encountered in the dial string.

Range: 0-255 seconds
Default: 2

3.3.3.10 S10 - Lost Carrier To Hang Up Delay

S10 sets the length of time, in tenths of a second, that the modem waits before hanging up after a loss of carrier. This allows
for a temporary carrier loss without causing the local modem to disconnect. When register S10 is set to 255, the modem
functions as if a carrier is always present.

The actual interval the modem waits before disconnecting is the value in register S10 minus the value in register S9.
Therefore, the S10 value must be greater than the S9 value or else the modem disconnects before it recognizes the carrier.

Range: 1-255 tenths of a second
Default: 14 (1.4 seconds)

3.3.3.11 S11 - DTMF Tone Duration

S11 sets the duration of tones in DTMF dialing. This value has no effect on pulse dialing.

Range: 50-255 milliseconds
Default: 95 (95 milliseconds)

3.3.3.12 S12 - Escape Prompt Delay (EPD)

S12 defines the maximum period, in fiftieths of a second, allowed between receipt of the last character of the three escape
character sequence from the DTE and sending of the OK result code to the DTE. If any characters are detected during this
time, the OK will not be sent. Note that sending of the OK result code does not affect entry into command mode. (See 3.1.3.)

Range: 0-255 1/50 of a second
Default: 50 (1 second)

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3.3.3.13 S18 - Test Timer

S18 sets the length of time, in seconds, that the modem conducts a test (commanded by &T1) before returning to the
command mode. If this parameter value is zero, the test will not automatically terminate; the test must be terminated from the
command mode by issuing an &T0 or H command. When S18 is non-zero, the modem returns the OK message upon test
termination.

Range: 0-255 seconds
Default: 0

3.3.3.14 S29 - Flash Dial Modifier Time

S29 sets the length of time, in units of 10 ms, that the modem will go on-hook when it encounters the flash (!) dial modifier in
the dial string. The time can be limited as it is a country dependent parameter.

Range: 0-255 10 ms intervals
Default: 70 (700 ms)

3.3.3.15 S30 - Disconnect Inactivity Timer

S30 sets the length of time, in tens of seconds, that the modem will stay online before disconnecting when no data is sent or
received. In error-correction mode, any data transmitted or received will reset the timer. In other modes, any data transmitted
will reset the timer. The timer is inoperative in synchronous mode.

Range: 0-255 tens of seconds (0-2550 seconds)
Default: 0 (disabled)

3.3.3.16 S46 - Data Compression Control

S46 controls selection of compression. The following actions are executed for the given values:

Range: 136 or 138
Default: 138

S46=136 Execute error correction protocol with no compression.
S46=138 Execute error correction protocol with compression. (Default.)

3.3.3.17 S95 - Extended Result Codes Control

A bit set to a 1 in this parameter, in conjunction with the W command, will enable the corresponding extended result code
(see Section 3.5 and Table 3-14).

The +MR, +ER, and +DR settings also control S95 bits 2, 3, and 5, respectively. The more recent settings of +MR, +ER, and
+DR, or host writing of S95 bits 2, 3, and 5, along with the W command setting, determine the corresponding actual result
code reporting (see +MR, +ER, DR, and W commands).

Default: 0

Bit 0 CONNECT result code indicates DCE speed instead of DTE speed.
Bit 1 Reserved
Bit 2 Enable +MCR: XXXX result code (XXXX = modulation) and +MRR: XXXX result code (XXXX =

rate). (See +MR.)

Bit 3 Enable +ER:XXXX result code (XXXX = protocol identifier). (See +ER.)

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Bit 4 Reserved.
Bit 5 Enable +DR result code (XXXX = compression type). (See +DR.)
Bits 6-7 Reserved.

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3.4 CELLULAR COMMANDS

3.4.1.1 +WS - Enable/Disable PDC

The modem enables or disables PDC mode according to the parameter supplied.
Syntax

+WS=[value>]

Defined Values

<value> Decimal number corresponding to the selected option.

1 Disables PDC mode. (Default.)
20 Enables PDC mode.

Result Codes

OK <value> = 1 or 20.
ERROR Otherwise.

3.4.1.2 PDC High-Speed Data Communication Mode Commands

Commands supported in PDC mode are listed below. All parameters and setting are in accordance commands described
elsewhere in this document unless otherwise stated. Consult the software release notes for current command applicability.

Communication:
Supported Mode:

The following commands are effective in the PDC mode:

A
DGo o
E
H
I
O
Sn
V
W
X
Z
&C
&D
&F
&V
&W
%Z

Notes:

Go off-hook and start negotiation with remote equipment.

Set DTE echo format according to specified parameter.
Execute hang-up sequence.
Issue modem IDs.
Enter online mode from command mode.
Read or write S register values.
Control result code output format.
Control CONNECT message output format.
Control extended result code output format.
Soft-reset the modem.
Control RLSD and DCD signals output.
Control DTR signal output.
Recover factory default parameters.
Display current configuration.
Store current configuration.
Start control serial data pass-through mode; return to normal mode by escape sequence (“+++”).

PDC high-speed data mode (RCR STD-27F) (Low-speed mode and fax mode are not supported.)
Data communication, control serial data pass-through mode (600 bps)

ff-hook, dial specified number, and start negotiation with remote modem.

1. Other commands will be accepted in PDC mode, but no action will be taken except to return the “OK” result code.

2. BREAK signal transfer is not supported.

3. IWF setting is always “default”.

4. Default (or POTS) mode is stored with &W: “ATZ” starts POTS mode.
PDC mode is stored with &W: “ATZ” starts PDC mode.

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3.5 RESULT CODES

The modem responds to commands from the DTE and to activity on the line by signaling to the DTE in the form of result
codes. The result codes that the modem can send are described in Table 3-14.

Two forms of each result code are available: long-form, an English-like "verbose" response, and short-form, a data-like
numeric response (included in parentheses following the long-form). The long-form code is preceded and terminated by the
sequence < CR> < LF>. The short-form is terminated by < CR>, only with no preceding sequence.

If result messages are suppressed, nothing is returned to the DTE. The long-form results codes can be modified by the OEM
through the .INF file.

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Table 3-14. Result Code Definitions

Code Message Meaning

+F4 +FCERROR High speed fax data (V. 27, V.29, V.33, or V.17) is expected but a V.21 signal is received.

0 OK A command line has been executed.
1 CONNECT For X command values specifying no speed reporting, the modem has c onnected to the line and either the

2 RING An incoming ring signal is detected on the line. What qualifies as a ri ng signal is determined by country-

3 NO CARRIER Sent when attempting to establish a call if :

4 ERROR Sent during an attempt to execute a command line if any of the following conditions occur:

5 CONNECT 1200 The modem has connected t o the line and either the line speed is 1200 bps and DCE speed reporting is

6 NO DIALTONE For X2 and X4, the modem has been instructed to wait for dial tone during dialing but none is received.

7 BUSY F or X3 and X4, if busy tone detection is enforced, t he busy (engaged) signal is detected on the l i ne when

8 NO ANSWER The modem is attempting to originate a call if a continuous ringbac k signal is detected on the li ne until the

9 CONNECT 600 The modem has connected to the line, the DTE speed is 600 bps, and DTE speed reporti ng i s enabled.

10 CONNECT 2400 The modem has connect ed to the line and either the line speed is 2400 bps and DCE speed reporting is

11 CONNECT 4800 The modem has connect ed to the line and either the line speed is 4800 bps and DCE speed reporting is

12 CONNECT 9600 The modem has connect ed to the line and either the line speed is 9600 bps and DCE speed reporting is

13 CONNECT 7200 The modem has connect ed to the line at 7200 bps and DCE speed reporting i s enabled.
14 CONNECT 12000 The modem has connected to the l i ne at 12000 bps and DCE speed reporting is enabled.
15 CONNECT 14400 The modem has connected to the l i ne at 14400 bps and DCE speed reporting is enabled.
16 CONNECT 19200 The modem has connected to the l i ne and ei ther the line speed is 19200 bps and DCE speed reporting is

17 CONNECT 38400 The modem has connected to the l i ne, the DTE speed is 38400 bps, and DTE speed report i ng i s enabled.
18 CONNECT 57600 The modem has connected to the l i ne, the DTE speed is 57600 bps, and DTE speed report i ng i s enabled.
19 CONNECT 115200 The modem has c onnec ted to the line, the DTE speed is 115200 bps, and DTE speed reporting is

22 CONNECT

75TX/1200RX

23 CONNECT

1200TX/75RX

24 DELAYED For X4, sent when a call fails to connect and the number dialed is considered 'delayed' due to country

32 BLACKLISTED For X4, sent when a call fails to connect and the number dialed is considered 'blacklisted'.

line speed is 300 bps and line speed is enabled, or the DTE speed is 300 bps and DTE speed reporting is
enabled.

dependent parameters, m odi f i abl e through ConfigurACE.
When cellular interface is selected, RING indicates that the c el l ul ar phone i s receiving an receiving an

incoming call.

Ringback is detected and later ceases but no carrier is detected within the period of time determined by
register S7, or

1. No ringback is detected withi n t he period of time determi ned by regi ster S7.

2. Also sent when the modem aut o-di sconnects due to loss of carrier.

For X0, sent for the following conditions:

1. If busy tone detection is enforced, busy or circuit busy has been detected.

2. If dial tone detection is enforced or selected, dial tone has not been detected.

1. The command line cont ai ns a syntax error.

2. The modem cannot execute a command contained in the command line, i.e., the command does
not exist or is not supported.

3. A command param eter within the command line i s outside the permitt ed range.

For X0, X1, X2, and X3, this message is sent instead of DE LAYED and BLACKLISTED.

enabled, or the DTE speed is 1200 bps and DTE speed reporting is enabled.

When cellular phone interface is selected, indicates that cell ul ar service is not currently avail abl e.

the modem is att e mpting to originate a call.

expiration of the timer S7.

enabled, or the DTE speed is 2400 bps and DTE speed reporting is enabled.

enabled, or the DTE speed is 4800 bps and DTE speed reporting is enabled.

enabled, or the DTE speed is 9600 bps and DTE speed reporting is enabled.

enabled, or the DTE speed is 19200 bps and DTE speed reporting is enabled.

enabled.
The modem has establi shed a V.23 originate connection and l i ne speed reporting is enabled.

The modem has establi shed a V.23 answer connection and line speed report i ng i s enabled.

blacklisting requirements.

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Table 3-14. Result Code Definitions (Cont’d)

Code Message Meaning

33 FAX A fax modem connection is established in a facsimile mode.
35 DATA A data modem connection is established i n a f acsimile mode.
40 +MRR: 300 The modem has connected to the li ne at 300 bps and carrier reporting is enabled. (See S 95 and Xn.)
44 +MRR: 1200/75 The V.23 backward channel carrier i s detected and carrier reporting is enabl ed. (See S95 and Xn.)
45 +MRR: 75/1200 The V.23 forward channel carrier is detected and carrier reporting is enabl ed. (See S95 and Xn.)
46 +MRR: 1200 The modem has connected to the line at 1200 bps and c arri er report i ng i s enabled. (See S95 and Xn.)
47 +MRR: 2400 The modem has connected to the line at 2400 bps and c arri er report i ng i s enabled. (See S95 and Xn.)
48 +MRR: 4800 The modem has connected to the line at 4800 bps and c arri er report i ng i s enabled. (See S95 and Xn.)
49 +MRR: 7200 The modem has connected to the line at 7200 bps and c arri er report i ng i s enabled. (See S95 and Xn.)
50 +MRR: 9600 The modem has connected to the line at 9600 bps and c arri er report i ng i s enabled. (See S95 and Xn.)
51 +MRR: 12000 The modem has connected to the line at 12000 bps and c arri er report i ng i s enabled. (See S95 and Xn.)
52 +MRR: 14400 The modem has connected to the line at 14400 bps and c arri er report i ng i s enabled. (See S95 and Xn.)
53 +MRR: 16800 The modem has connected to the line at 16800 bps and c arri er report i ng i s enabled. (See S95 and Xn.)
54 +MRR: 19200 The modem has connected to the line at 19200 bps and c arri er report i ng i s enabled. (See S95 and Xn.)
55 +MRR: 21600 The modem has connected to the line at 21600 bps and c arri er report i ng i s enabled. (See S95 and Xn.)
56 +MRR: 24000 The modem has connected to the line at 24000 bps and c arri er report i ng i s enabled. (See S95 and Xn.)
57 +MRR: 26400 The modem has connected to the line at 26400 bps and c arri er report i ng i s enabled. (See S95 and Xn.)
58 +MRR: 28800 The modem has connected to the line at 28800 bps and c arri er report i ng i s enabled. (See S95 and Xn.)
59 CONNECT 16800 The modem has connected to the l i ne, the DTE speed is 16800 bps and DTE speed reporti ng i s enabled.
61 CONNECT 21600 The modem has connected to the l i ne, the DTE speed is 21600 bps and DTE speed reporti ng i s enabled.
62 CONNECT 24000 The modem has connected to the l i ne, the DTE speed is 24000 bps and DTE speed reporti ng i s enabled.
63 CONNECT 26400 The modem has connected to the l i ne, the DTE speed is 26400 bps and DTE speed reporti ng i s enabled.
64 CONNECT 28800 The modem has connected to the l i ne and ei ther the line speed is 28800 bps and DCE speed reporting is

66 +DR: ALT The modem has connected to the line in MNP Class 5 and +DR: message reporting is enabl ed. (See S95,

67 +DR: V. 42B The modem has connected to the line in V.42 bis and +DR: message reporting is enabl ed. (See S95, Wn,

69 +DR: NONE The modem has connected to the line without data c ompression and +DR: mes sage reporting is enabled.

70 +ER: NONE The modem has connected t o the line without any form of error correc tion and the +ER: message

77 +ER: LA P M The modem has connected to the line in V.42 LAPM error correction mode and +E R: message reporting

78 +MRR: 31200 The modem has connected to the line at 31200 bps and c arri er report i ng i s enabled. (See S95 and Xn.)
79 +MRR: 33600 The modem has connected to the line at 33600 bps and c arri er report i ng i s enabled. (See S95 and Xn.)
80 +ER: A LT Sent when the modem has connected i n the MNP mode of error correction, and +E R: message reporting

83 LINE I N US E The modem at tempted to go off-hook when an extension was already occupying the line.
84 CONNECT 33600 The modem has connected to the li ne, the DTE speed is 33600 bps and the DTE s peed reporting is

91 CONNECT 31200 The modem has connected to the li ne DTE speed is 31200 bps and the modem is to report the DTE

134 +MCR: B103 The modem has connected t o the line with Bell 103 modulation and modulation reporting is enabled. (See

135 +MCR: B212 The modem has connected t o the line with Bell 212 modulation and modulation reporting is enabled. (See

enabled, or the DTE speed is 28800 bps and DTE speed reporting is enabled.

Wn, and Xn.)

and Xn.)

(See S95, Wn, and Xn.)

reporting has been enabled. (See S95, Wn, and Xn.)

has been enabled. (See S95, Wn, and Xn.)

has been enabled. (See S95, Wn, and Xn.)

enabled.

speed upon connecting.

+MR, S95 and Xn.)

+MR, S95 and Xn.)

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Table 3-14. Result Code Definitions (Cont’d)

Code Message Meaning

136 +MCR: V21 The modem has connected t o the line with ITU-T V.21 modulation and modulation reporting is enabled.

137 +MCR: V22 The modem has connected t o the line with ITU-T V.22 modulation and modulation reporting is enabled.

138 +MCR: V22B The modem has connected to the li ne with I T U-T V .22 bis modulation and modul ation reporting is enabled.

139 +MCR: V23 The modem has connected t o the line with ITU-T V.23 modulation and modulation reporting is enabled.

140 +MCR: V32 The modem has connected t o the line with ITU-T V.32 modulation and modulation reporting is enabled.

141 +MCR: V32B The modem has connected to the li ne with I T U-T V .32 bis modulation and modul ation reporting is enabled.

142 +MCR: V34 The modem has connected t o the line with ITU-T V.34 modulation and modulation reporting is enabled.

144 +MCR: K56 The modem has connected t o the line with K56flex modulation and modul ation reporting is enabled. (See

145 +MCR: V90 The modem has connected t o the line with ITU-T V.90 modulation and modulation reporting is enabled.

150 +MRR: 32000 The modem has connected to the line at 32000 bps and carrier reporting is enabl ed. (See S95 and Xn.)
151 +MRR: 34000 The modem has connected to the line at 34000 bps and carrier reporting is enabl ed. (See S95 and Xn.)
152 +MRR: 36000 The modem has connected to the line at 36000 bps and carrier reporting is enabl ed. (See S95 and Xn.)
153 +MRR: 38000 The modem has connected to the line at 38000 bps and carrier reporting is enabl ed. (See S95 and Xn.)
154 +MRR: 40000 The modem has connected to the line at 40000 bps and carrier reporting is enabl ed. (See S95 and Xn.)
155 +MRR: 42000 The modem has connected to the line at 42000 bps and carrier reporting is enabl ed. (See S95 and Xn.)
156 +MRR: 44000 The modem has connected to the line at 44000 bps and carrier reporting is enabl ed. (See S95 and Xn.)
157 +MRR: 46000 The modem has connected to the line at 46000 bps and carrier reporting is enabl ed. (See S95 and Xn.)
158 +MRR: 48000 The modem has connected to the line at 48000 bps and carrier reporting is enabl ed. (See S95 and Xn.)
159 +MRR: 50000 The modem has connected to the line at 50000 bps and carrier reporting is enabl ed. (See S95 and Xn.)
160 +MRR: 52000 The modem has connected to the line at 52000 bps and carrier reporting is enabl ed. (See S95 and Xn.)
161 +MRR: 54000 The modem has connected to the line at 54000 bps and carrier reporting is enabl ed. (See S95 and Xn.)
162 +MRR: 56000 The modem has connected to the line at 56000 bps and carrier reporting is enabl ed. (See S95 and Xn.)
165 CONNECT 32000 The m odem has connected to the li ne at 32000 bps and DCE speed reporting is enabled.
166 CONNECT 34000 The m odem has connected to the li ne at 34000 bps and DCE speed reporting is enabled.
167 CONNECT 36000 The m odem has connected to the li ne at 36000 bps and DCE speed reporting is enabled.
168 CONNECT 38000 The m odem has connected to the li ne at 38000 bps and DCE speed reporting is enabled.
169 CONNECT 40000 The m odem has connected to the li ne at 40000 bps and DCE speed reporting is enabled.
170 CONNECT 42000 The m odem has connected to the li ne at 42000 bps and DCE speed reporting is enabled.
171 CONNECT 44000 The m odem has connected to the li ne at 44000 bps and DCE speed reporting is enabled.
172 CONNECT 46000 The m odem has connected to the li ne at 46000 bps and DCE speed reporting is enabled.
173 CONNECT 48000 The m odem has connected to the li ne at 48000 bps and DCE speed reporting is enabled.
174 CONNECT 50000 The m odem has connected to the li ne at 50000 bps and DCE speed reporting is enabled.
175 CONNECT 52000 The m odem has connected to the li ne at 52000 bps and DCE speed reporting is enabled.
176 CONNECT 54000 The m odem has connected to the li ne at 54000 bps and DCE speed reporting is enabled.
177 CONNECT 56000 The m odem has connected to the li ne at 56000 bps and DCE speed reporting is enabled.
178 CONNECT 230400 The modem has connected to the li ne, the DTE speed is 230400 bps, and DTE speed report i ng i s

180 CONNECT 28000 The modem has connected to the line at 28000 bps and DCE SPEED reporti ng is enabled.
181 CONNECT 29333 The modem has connected to the line at 29333 bps and DCE SPEED reporti ng is enabled.
182 CONNECT 30667 The modem has connected to the line at 30667 bps and DCE SPEED reporti ng is enabled.

(See +MR, S95 and Xn.)

(See +MR, S95 and Xn.)

(See +MR, S95 and Xn.)

(See +MR, S95 and Xn.)

(See +MR, S95 and Xn.)

(See +MR, S95 and Xn.)

(See +MR, S95 and Xn.)

+MR, S95 and Xn.)

(See +MR, S95 and Xn.)

enabled.

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Table 3-14. Result Code Definitions (Cont’d)

Code Message Meaning

183 CONNECT 33333 The modem has connected to the line at 33333 bps and DCE SPEED reporti ng is enabled.
184 CONNECT 34667 The modem has connected to the line at 34667 bps and DCE SPEED reporti ng is enabled.
185 CONNECT 37333 The modem has connected to the line at 37333 bps and DCE SPEED reporti ng is enabled.
186 CONNECT 38667 The modem has connected to the line at 38667 bps and DCE SPEED reporti ng is enabled.
187 CONNECT 41333 The modem has connected to the line at 41333 bps and DCE SPEED reporti ng is enabled.
188 CONNECT 42667 The modem has connected to the line at 42667 bps and DCE SPEED reporti ng is enabled.
189 CONNECT 45333 The modem has connected to the line at 45333 bps and DCE SPEED reporti ng is enabled.
190 CONNECT 46667 The modem has connected to the line at 46667 bps and DCE SPEED reporti ng is enabled.
191 CONNECT 49333 The modem has connected to the line at 49333 bps and DCE SPEED reporti ng is enabled.
192 CONNECT 50667 The modem has connected to the line at 50667 bps and DCE SPEED reporti ng is enabled.
193 CONNECT 53333 The modem has connected to the line at 53333 bps and DCE SPEED reporti ng is enabled.
194 CONNECT 54667 The modem has connected to the line at 54667 bps and DCE SPEED reporti ng is enabled.
195 +MRR: 28000 The modem has connected to the line at 28000 bps and carrier reporting is enabl ed. (See S95 and Xn.)
196 +MRR: 29333 The modem has connected to the line at 29333 bps and carrier reporting is enabl ed. (See S95 and Xn.)
197 +MRR: 30667 The modem has connected to the line at 30667 bps and carrier reporting is enabl ed. (See S95 and Xn.)
198 +MRR: 33333 The modem has connected to the line at 33333 bps and carrier reporting is enabl ed. (See S95 and Xn.)
199 +MRR: 34667 The modem has connected to the line at 34667 bps and carrier reporting is enabl ed. (See S95 and Xn.)
200 +MRR: 37333 The modem has connected to the line at 37333 bps and carrier reporting is enabl ed. (See S95 and Xn.)
201 +MRR: 38667 The modem has connected to the line at 38667 bps and carrier reporting is enabl ed. (See S95 and Xn.)
202 +MRR: 41333 The modem has connected to the line at 41333 bps and carrier reporting is enabl ed. (See S95 and Xn.)
203 +MRR: 42667 The modem has connected to the line at 42667 bps and carrier reporting is enabl ed. (See S95 and Xn.)
204 +MRR: 45333 The modem has connected to the line at 45333 bps and carrier reporting is enabl ed. (See S95 and Xn.)
205 +MRR: 46667 The modem has connected to the line at 46667 bps and carrier reporting is enabl ed. (See S95 and Xn.)
206 +MRR: 49333 The modem has connected to the line at 49333 bps and carrier reporting is enabl ed. (See S95 and Xn.)
207 +MRR: 50667 The modem has connected to the line at 50667 bps and carrier reporting is enabl ed. (See S95 and Xn.)
208 +MRR: 53333 The modem has connected to the line at 53333 bps and carrier reporting is enabl ed. (See S95 and Xn.)
209 +MRR: 54667 The modem has connected to the line at 54667 bps and carrier reporting is enabl ed. (See S95 and Xn.)

Notes:

1. See Vn for result code sel ection, i.e., short form (result code) or verbose/extended (result message).

2. See Wn for extended connect message control.

3. See S95 for extended result c ode enabl i ng options (which override some Wn c om m ands).

4. See Xn for extended result c ode subset enabling options.

5. See \Vn for single line connect message enable options.

6. See +MR for modulation reporting control.

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4. FAX CLASS 1 AND FAX CLASS 1.0 COMMANDS

4.1 FAX I/O PROCESSING

The fax I/O interface supports asynchronous serial and parallel interfaces. The character format is 8 bits data, no parity, and
1 stop bit. Start and stop elements are removed from the transmit data and added to the receive data. Both transmit and
receive data are buffered. Flow control using XON/XOFF or RTS/CTS is provided.

Unique control character strings are identified, filtered, or reinserted into the I/O data stream. These control characters and
their resultant action are described below.

4.1.1 DTE-to-Modem Transmit Data Stream
Characters Detected Action Taken

<DLE><data> Delete <DLE><data> characters.
<DLE><ETX> Recognize as a string terminator and take appropriate action.
<DLE><DLE> Replace with single <DLE> character.

4.1.2 Modem-to-DTE Receive Data Stream
Characters Detected Action Taken

<DLE> Insert extra <DLE> ahead of <DLE>.

The modem also identifies the end of a frame by inserting <DLE><ETX> into the data stream after the FCS bytes.

4.1.3 Fax Mode Selection

Fax Class 1 and Fax Class 1.0 commands are identified in Table 4-1. . Fax Class 1.0 includes all Fax Class 1 commands.

Table 4-1. Fax Class 1 and Fax Class 1.0 Commands

Command/Parameter Function Applicable in

+

FCLASS=<class>

+FAE=<value> Auto answer enable X X

+

FTS=<time

+

FRS=<time

+

FTM=<mod

+

FRM=<mod

+

FTH=<mod

+

FRH=<mod

+

FAR=<off/on

+

FCL=<time>

+

FDD=<value

+

FIT=<time>, <action

+FPR=<rate> Fixed DTE Rate - X

+

FMI

+

FMM

+

FMR
+FLO Flow Control - X
+IFC Local DTE-modem flow control (see Section 3.2.1.14) X X
A Answer (see Section 3.2.3.4) X X
D <string
H Hangup (see Section3.2.3.5) X X

X = Applicable; - = Not applicable

>

>

>
>

>

>

>

>

>

Select, read or test service class X X

Stop transmiss i on and pause X X
Wait for silence X X
Transmit data with <mod> c arri er X X
Receive data with <mod> carrier X X
Transmit HDLC data with <mod> c arri er X X
Receive HDLC data with <mod> carrier X X
Adaptive reception control - X
Carrier loss timeout - X
Double escape character replacement control - X
DTE inactivity timeout - X

>

Report manufacturer ID - X
Report model ID - X
Report revision ID - X

Dial (see Section 3.2.3. 1) X X

Fax Class 1

Applicable in
Fax Class 1.0

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4.1.4 Fax Origination

Origination of fax calls is made using the ATD command. Upon completion of the dial function, a calling tone at 1100 Hz is
transmitted, with a cadence of 0.5 seconds on and 3 seconds off. The modem automatically enters mode +FRH=3 and sends
the CONNECT message to the DTE when FSK flags are detected from the remote.

4.1.5 Fax Answering

Answering of fax calls is identical to answering of data calls with the exception that the modem enters the fax handshaking
mode instead of the data handshaking mode after going off-hook. If +FAE=0, the modem, after sending answer tone,
automatically enters fax mode (+FTH=3), sends the CONNECT message to the DTE, and starts sending FSK flags. If
+FAE=1, the modem determines whether the caller is a data modem or fax modem and sends the DATA or FAX result code,
respectively, to the DTE.

4.1.6 Fax Control Transmission

Fax control transmission is initiated by the +FTH=<mod> command. After this command is issued, the modem generates the
CONNECT message and transmits carrier in the modulation scheme specified by the parameter n. The modem then transmits
HDLC flags for a minimum of 1 second. The modem continues to transmit the HDLC flags until it receives a character from
the DTE.

When characters are received from the DTE, the modem adds start and end flags, performs zero-bit insertion, generates
FCS, and deletes <DLE><chr> character pairs before transmitting the characters to the remote fax machine. Each
<DLE><DLE> sequence is transmitted as a single <DLE>. <DLE><ETX> is considered as the end of frame marker and is not
transmitted. All data received from the DTE after <DLE><ETX> is ignored by the modem until the modem generates either the
CONNECT, OK, or ERROR result code.

If no more data is in the transmit buffer and the final bit was a 1 (bit 4 of the second byte received from the DTE), the modem
generates the OK result code and returns to the command mode. If the final bit was a 0, the modem generates the CONNECT
message and waits for further data from the DTE while transmitting HDLC flags. If no more data is received before 5 seconds
elapse, the modem drops carrier, goes on-hook, and generates the ERROR result code.

4.1.7 Fax Control Reception

Fax control reception is initiated using the AT+FRH=<mod> command. After this command is issued, the modem looks for
carrier in the modulation scheme specified by the parameter n. If no carrier is detected before the period of time specified by
register S7 expires, the modem generates the NO CARRIER message and returns to command mode. If a carrier is detected
that is not the one specified by the parameter n, the modem generates the +FCERROR message and returns to the
command mode. If the specified carrier is detected, the modem generates the CONNECT message and enters the HDLC
receive mode.

In HDLC receive mode, the modem receives HDLC frames from the remote fax machine, strips the flags, performs zero-bit
deletion, performs error checking, and handles <DLE><chr> character pairs before passing the data to the DTE. The modem
prefixes each <DLE> character with another <DLE> character before sending it to the DTE. After the last byte in the frame,
the modem sends <DLE><ETX> to the DTE marking the end of the frame. The modem then generates either the OK
message if no errors were detected or the ERROR message if errors were detected (FCS is incorrect), and returns to
command mode.

While in command mode, the modem continues to receive data in the selected modulation scheme, and sends the data after
sending the CONNECT message to the DTE when the DTE reissues the +FRH command with the same parameter. If the
DTE issues the +FRH command with a different parameter, the modem clears all buffers and proceeds as described
previously.

If carrier is lost while in command mode and the DTE reissues the +FRH command with the same parameter, and there is no
data in the buffer, the modem sends the ERROR result code to the DTE and returns to the command mode. If there is data in
the buffer, the modem sends the next frame of buffered data to the DTE, followed by <DLE><ETX>, and either the ERROR
result code if errors were detected or the OK result code if no errors were detected. The modem then returns to command
mode.

The modem concludes an error is detected if carrier is lost for any period of time during or before the reception of a frame. If
carrier is lost for a time period longer than the time specified by the register S10, the modem finishes delivering the data in the

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receive buffer (if any) to the DTE, sends <DLE><ETX>, generates the ERROR message, and returns to command mode. All
subsequent data received from the remote is discarded.

If the modem detects a frame abort sequence (seven consecutive ones with no zero insertion) while it is waiting for a frame
beginning flag (it was receiving HDLC flags), it will wait for the HDLC flags again until either carrier is lost, or the DTE aborts
the process by sending an abort character or by dropping DTR with &D2 in effect. If the frame abort sequence is detected
while the modem is receiving a frame it finishes delivering the data in the receive buffer (if any) to the DTE, sends
<DLE><ETX>, generates the ERROR message, and returns to command mode. The modem keeps looking for HDLC flags
followed by more data from the remote, with the selected modulation scheme.

If the modem detects a receive buffer overflow condition, it concludes that there was an FCS error in that frame. The modem
will receive more frames only if a starting flag is detected and there is room in the receive buffer. If a starting flag is detected
and there is no room in the buffer, the modem discards all data in that frame.

If the modem receives any character from the DTE after the +FRH command (except flow control characters if software flow
control is in effect), or if the modem detects a high-to-low transition of the DTR signal while &D1 is in effect, it sends
<DLE><ETX> to the DTE, generates OK result code, and returns to command mode. The receive buffer is cleared and all
data received from the remote is discarded. If the modem detects a DTR drop while &D2 is in effect, it goes on-hook, sends
<DLE><ETX> to the DTE, generates OK result code, and returns to command mode. If the modem detects a DTR drop while
&D3 is in effect, the modem performs a warm reset.

4.1.8 Fax Data Transmission

Fax data transmission is initiated by the AT+FTM=<mod> command. After this command is issued, the modem generates the
CONNECT message and transmits carrier in the modulation scheme specified by the parameter n. The modem then transmits
constant 1 bits for a minimum of one second and continues to transmit constant 1 bits until it receives a character from the
DTE.

When data is received from the DTE, the modem deletes start and stop bits and deletes all <DLE><chr> character pairs
before transmitting the data to the remote. Each <DLE><DLE> sequence is transmitted as a single <DLE>. <DLE><ETX> is
considered as the end of stream marker, and is not transmitted. All data received from the DTE after the <DLE><ETX> is
ignored by the modem until the modem generates either the CONNECT, OK, or ERROR result code.

If no more data is in the transmit buffer, and the last transmitted character was not an ASCII NULL, the modem generates the
OK result code and returns to the command mode. If the last character transmitted was an ASCII NULL, the modem
generates the CONNECT message to the DTE and waits for further data from the DTE while transmitting NULLs to the
remote. If more data is received before five seconds elapse, the modem continues to transmit the data as described in the
previous paragraph. If five seconds elapse and no data is received from the DTE, the modem drops carrier, goes on-hook,
and generates the ERROR result code.

4.1.9 Fax Data Reception

Fax data reception is initiated using the AT+FRM=<mod> command. After this command is issued, the modem looks for
carrier in the modulation scheme specified by the parameter n. If no carrier is detected before the period of time specified by
register S7 expires, the modem generates the NO CARRIER message and returns to command mode. If a V.21 carrier is
detected when a high speed carrier is expected, the modem generates the +FCERROR message and returns to the
command mode. If the specified carrier is detected, the modem generates the CONNECT message and enters the data
receive mode.

While in data receive mode, the modem receives data from the remote, adds start and stop bits, and handles <DLE><chr>
character pairs before passing the data to the DTE. The modem prefixes each <DLE> character with another <DLE>
character before sending it to the DTE.

If the modem detects a receive buffer overflow condition, it stops receiving from the remote until there is room in the receive
buffer. The modem informs the DTE of the buffer overflow after it sends to the DTE the last character that was stored in the
buffer before the overflow occurred.

If the modem receives any character from the DTE after the +FRM command (except flow control characters if software flow
control is in effect), or if the modem detects a high-to-low transition of the DTR signal while &D1 is in effect, it sends
<DLE><ETX> to the DTE, generates the OK result code, and returns to command mode. The receive buffer is cleared and all
data received from the remote is discarded. If loss of DTR is detected while &D2 is in effect, the modem goes on-hook, sends

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Command Reference Manual

<DLE><ETX> followed by OK result code to the DTE, and returns to command mode. If the modem detects a DTR drop while
&D3 is in effect, the modem performs a warm reset.

4.2 COMMANDS AND PARAMETERS

4.2.1 Mode Entry Commands

4.2.1.1 +FCLASS=1 - Select Facsimile Class 1 Mode

+FCLASS=1 selects the Fax Class 1Mode. The Fax Class 1 Mode commands and responses described in this section are
applicable when command +FCLASS=1 as shown Table 4-1. (See Section 3.2.1.2 for the definition of the FCLASS
command.)

4.2.1.2 +FCLASS=1.0 - Select Facsimile Class 1.0 Mode

+FCLASS=1.0 selects the Fax Class 1.0 Mode. The Fax Class 1.0 Mode commands and responses described in this section
are applicable when command +FCLASS=1.0 shown Table 4-1. (See Section 3.2.1.2 for the definition of the FCLASS
command.)

4.2.2 Mode Commands

4.2.2.1 +FAE - Auto Answer Enable

This command enables or disables fax adaptive answer.
Syntax

+FAE=<value>

Defined Values

<value> Decimal number corresponding to the selected option.

0 Disable data /fax auto answer mode. (Default.)
1 Enable data /fax auto answer mode. The modem determines the calling type and

issues DATA result code (13) if the caller is a data modem or issues FAX result code
(15) if the caller is a fax modem.

4.2.2.2 +FTS - Transmit Silence

This command causes the modem to terminate a transmission and wait for <time> 10-ms intervals before responding with the
OK result code.

Syntax

+FTS=<time>

Defined Values

<time> Decimal number from 0 (default) to 255 which specifies the length of time in 10-ms intervals to delay

before responding with the OK result code after terminating the session.

Result Codes

OK Reported when transmission has been terminated for the specified amount of time.
ERROR <value> is invalid or this command is issued while the modem is on-hook.

Reporting Supported Range of Parameter Values
Command: +FTS=?

Response: +FTS: <time> range
Example: +FTS: 0-255

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4.2.2.3 +FRS - Receive Silence

This command causes the modem to listen and report an OK result code when silence has been detected on the line for the
specified period of time. This command will terminate when the required period of silence is detected or when the DTE sends
the modem another character other than XON or XOFF, which is discarded. In either event, the OK result code is returned.

This command is aborted if any character is received from the DTE after receipt of the command but before the time delay
elapses. In this case, the modem discards the aborting character and issues an OK result code.

Syntax

+FRS =<time>

Defined Values

<time> Decimal number from 0 (default) to 255 which specifies the length of time in 10-ms intervals to delay

before responding with the OK result code after detecting silence on the line.

Result Codes

OK Reported when silence has been present on the line for the specified amount of time or when the

DTE sends the modem a character other than XON or XOFF.

ERROR <value> is invalid or this command is issued while the modem is on-hook.

Reporting Supported Range of Parameter Values
Command: +FRS=?

Response: +FRS: <time> range
Example: +FRS: 0-255

4.2.2.4 +FTM - Transmit Facsimile

This command causes the modem to transmit data using the modulation defined below. When a valid <mod> value is
entered, the modem transmits the proper training sequence in the selected mode, followed by constant 1 bits until data is
received from the DTE. The modem also returns the CONNECT result code at the beginning of the training sequence.

Syntax

+FTM=<mod>

Defined Values

<mod> Decimal number corresponding to the selected modulation mode and data rates shown in Table 4-2.

Table 4-2. Fax Class 1 and Fax Class 1.0 Modulation Modes and Rates

<mod> Modulation Training Modulation Mode and Rate

3 V.21 300 bps
24 V.27 ter 2400 bps
48 V.27 ter 4800 bps
72 V.29 7200 bps
73 V.17 long 7200 bps long
74 V.17 short 7200 bps short
96 V.29 9600 bps
97 V.17 long 9600 bps long
98 V.17 short 9600 bps short
121 V.17 long 12000 bps long
122 V.17 short 12000 bps short
145 V.17 long 14400 bps long
146 V.17 short 14400 bps short

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Result Codes

CONNECT Reported when the modems begins the training sequence after receipt of a valid <mod> value.
ERROR If the modem’s transmit buffer becomes empty and the last transmitted character is NUL (00), the

modem continues to transmit NULs until the DTE sends more data or five seconds elapses. After five
seconds elapse with a empty transmit buffer, the modem will turn off the transmit carrier, return to the
command state, and report the ERROR result code.

OK If the modem’s transmit buffer becomes empty and the last transmitted character is was not NUL, the

modem will turn off the transmit carrier, return to the command state, and report the OK result code.

Reporting Current or Selected Values
Command: +FTM?

Response: +FTM: <mod>
Example: +FTM: 98 For V.17 9600 bps.

Reporting Supported Range of Parameter Values
Command: +FTM=?

Response: +FTM: (<mod> range)
Example: +FTM: 3,24,48,72,73,74,96,97,98,121,122,145,146

4.2.2.5 +FRM - Receive Facsimile

This command causes the modem to enter the receiver mode using the modulation defined below.
Syntax

+FRM=<mod>

Defined Values

<mod> Decimal number corresponding to the selected modulation mode and data rates shown in Table 4-2.

Reporting Current or Selected Values
Command: +FRM?

Response: +FRM: <mod>
Example: +FRM: 98 For V.17 9600 bps.

Reporting Supported Range of Parameter Values
Command: +FRM=?

Response: +FRM: (<mod> range)
Example: +FRM: 3,24,48,72,73,74,96,97,98,121,122,145,146

Result Codes

CONNECT Reported when the selected carrier is detected.
+FCERROR Reported if another carrier is detected and FAR=0; the modem then returns to the command state.
NO CARRIER Reported if loss-of-carrier is detected.
OK Reported if the DTE sends any character to the modem other than XON or XOFF while operating in

configured flow control from the DTE; the modem then returns to the command state.

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4.2.2.6 +FTH - Transmit Data with HDLC Framing

This command causes the modem to transmit data using HDLC protocol and the modulation defined below.
Syntax

+FTH=<mod>

Defined Values

<mod> Decimal number corresponding to the selected modulation mode and data rates shown in Table 4-2.

Result Codes

CONNECT Reported for either of two conditions:

1. At the beginning of transmission of the training pattern for the selected modulation.

2. If the Final Frame bit is 0.

OK Reported for either of two conditions:

1. If the Final Frame Bit is 1.

2. if the DTE sends only <DLE><ETX> (a null frame) while transmitting flags.

ERROR Reported if five seconds elapse from the time when the modem reported the CONNECT result code

without any additional data transmitted from the DTE; the modem then turns off carrier and returns to
the command mode.

Reporting Current or Selected Values
Command: +FTH?

Response: +FTH: <mod>
Example: +FTH: 98 For V.17 9600 bps.

Reporting Supported Range of Parameter Values
Command: +FTH?

Response: +FTH?
Example: +FTH: 98 For V.17 9600 bps.

4.2.2.7 +FRH - Receive Data with HDLC Framing

This command causes the modem to receive frames using HDLC protocol and the modulation defined below. An ERROR
response code results if this command is issued while the modem is on-hook.

Syntax

+FRH=<mod>

Defined Values

<mod> Decimal number corresponding to the selected modulation mode and data rates shown in Table 4-2.

Reporting Current or Selected Values
Command: +FRH?

Response: +FRH: <mod>
Example: +FRH: 98 For V.17 9600 bps.

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Reporting Supported Range of Parameter Values
Command: +FRH?

Response: +FRH?
Example: +FRH: 98 For V.17 9600 bps.

Result Codes

CONNECT Reported for either of two conditions:

1. When the selected carrier is detected with an HDLC flag.

2. If the DTE sends another +FTH=<MOD> command after sending the result code
indicating frame reception is complete.

+FCERROR Reported if a different carrier is detected and FAR=0.
NO CARRIER Reported if loss of carrier is detected.
OK Reported for either of two conditions:

1. If a frame was received correctly.

2. If the DTE sends any character other than XON or XOFF while the modem is in the
configured flow control.

ERROR Reported if a frame was received in error.

4.2.3 Service Class 1 Parameters

4.2.3.1 +FAR - Adaptive Reception Control

If Adaptive Reception is enabled, the modem adaptively detects the selected message carrier or V.21 control messages. If
the expected carrier is detected, the modem operates as specified in the respective +FRM=<mod> or +FRH=<mod
commands. If V.21 flag preamble is detected instead, the modem issues a +FRH:3 intermediate result code, and then
executes an implied +FRH=3 command.

>

Write Syntax

FAR=<value

+

Defined Values

<value> Decimal number corresponding to the selected option.

Reporting Current or Selected Values
Command:+FAR?

Response:+FAR: <value
Example: +FAR: 0 For the default setting.

Reporting Supported Range of Parameter Values
Command: +FAR=?

Response: +FAR: (<value> range )
Example: +FAR: (0,1)

>

0 Disable Adaptive Reception. (Default.)
1 Enable Adaptive Reception.

>

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4.2.3.2 +FCL - Carrier Loss Timeout

This parameter allows the DTE to select the modem’s loss-of-carrier delay between initial loss-of-carrier and qualified loss-of­carrier, when the modem will give up and exit a receive mode. Intermediate (less than FCL timeout) loss-of-carrier should be
indicated by insertion of the SQ-BAD signal quality indicator in the received data stream.

In unframed receive modes, if the modem detects RTC as described in Recommendation T.30 prior to initial loss of the high
speed carrier, or if the modem detects V.21 carrier after initial loss of high speed carrier, then the modem immediately
accepts the loss-of-carrier as qualified, without waiting for the FCL timer to expire.

In HDLC receive modes, if the modem detects HDLC abort prior to initial loss of the high speed carrier, or if the modem
detects V.21 carrier after initial loss of high speed carrier, then the modem l immediately accepts the loss-of-carrier as
qualified, without waiting for the FCL timer to expire.

Write Syntax

FCL=<time

+

Defined Values

<value> Decimal number representing the loss-of-carrier delay time in units of 100 ms. The range is 0 - 255.

Reporting Current or Selected Values
Command: +FCL?

Response: +FCL: <time
Example: +FCS: 0 For the default setting.

>

>

Reporting Supported Range of Parameter Values
Command: +FCL=?

Response: +FCL: (<time> range)
Example: +FCL: (0-255)

4.2.3.3

This parameter conditions the use of the •DLE•••SUB• pair to encode consecutive <1/0
prevent unbound expansion of data that contains many <1/0> patterns.

Syntax

Defined Values

Reporting Current or Selected Values
Command: +FDD?

Response: +FDD: <value>
Example: +FDD: 0 For the default setting.

+

FDD - Double Escape Character Replacement

1/0> in data. This may be used to

><

FDD=<value

+

<value> Decimal number corresponding to the selected option. For modem decode of <DLE><SUB>, the

>

defined range are:

0 <DLE> <DLE> or discard (default and only)
1 <DLE> <DLE> (not supported)

For modem encoding of <1/0> <1/0>the defined values are:

0 <DLE> <DLE> <DLE> <DLE> (default and only)
1 <DLE> <SUB> (not supported)

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Reporting Supported Range of Parameter Values
Command: +FDD=?

Response: +FDD: (<value> range)
Example: +FDD: (0)

4.2.3.4

+

FIT - DTE Inactivity Timeout

This command specifies a DTE inactivity timeout value that allows the modem to break away from an unsuccessful
connection attempt at any stage of a facsimile transfer. The DTE inactivity timer operates only while the modem is off-hook.

Syntax

FIT=<time>,<action

+

>

Defined Values

<

time

>

The <time> parameter indicates the DTE inactivity timeout in seconds. The value of 0 indicates that
timeout is disabled (default). The required timeout range is 1 to 255 seconds. The inactivity timer
starts when the modem has taken some action that requires DTE response. If the DTE does
respond, the modem resets the inactivity timer. Inactivity timer related events are listed in Table 4-3.

action

<

>

The <action> parameter has two meanings.

0 Upon timeout, the modem will go on-hook, executing an implied ATH command;

then reset to +FCLASS=0.

1 Upon timeout, the DCE will only go on-hook.

Reporting Current or Selected Values
Command:+FIT?

Response:+FIT: <time>,<action
Example:

FIT: 0,0 For the default settings.

+

>

Reporting Supported Range of Parameter Values
Command:+FIT?

Response: +FIT: (<time> range), (<action> range)
Example: +FIT: (0-255),(0-1)

Table 4-3. Inactivity Timer Start and Stop Events

On-line state Start ti m er event Stop ti m er event

Waiting for a c ommand modem sends final result code DTE s ends AT or “at”
Waiting for t ransmit data modem s ends CONNECT after

Waiting for t ransmit data
Waiting to deli ver received data

Waiting to deliver received data DTE s et s V.24 Ckt 133 OFF after

4-10

+

FTM or +FTH command
modem sends <XON> or sets CTS ON
modem sends <XOFF> after +FRM or +FRH

command

+

FRM or +FRH command

Conexant

DTE sends data

DTE sends data
DTE sends <XON

DTE sets V.24 Ckt 133 ON

>

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Command Reference Manual

4.2.3.5 +FPR - Fixed DTE Rate

This numeric extended-format parameter specifies the data rate at which the modem will accept commands during on-line
operation. It may be used to select operation at rates at which the modem is not capable of automatically detecting the data
rate being used by the DTE. Specifying a value of 0 disables the function and allows operation only at rates automatically
detectable by the modem. The specified rate takes effect following the issuance of any result code(s) associated with the
current command line.

The <rate> specified does not apply in OnLine Data State if Normal Mode (Direct Mode) of operation is selected.
Syntax

+FPR=<rate code>

Defined Values

<rate code> Specifies the DTE-modem interface operation rate in bits/s with a rate code. The available rate codes

are:

0 Automatic detection (default)
1 2400 bits/s (executes +IPR=2400)
2 4800 bits/s (executes +IPR=4800)
4 9600 bits/s (executes +IPR=9600)
8 19200 bits/s (executes +IPR=19200)
10 38400 bits/s (executes +IPR=38400)
18 57400 bits/s (executes +IPR=57400)

If unspecified or set to 0, automatic detection is selected and the character format is also forced to
autodetect, +ICF=0.

If the rate specified is not supported by the modem, an ERROR result code will be returned.

Reporting Current or Selected Values
Command: +FPR?

Response: <rate code>
Example 1: 0 For automatic rate detection.
Example 2: 18 For 57600 bits/s.

Reporting Supported Range of Parameter Values
Command: +FPR=?

Response: (<rate code> range)
Example: (0,1,2,4,8,10,18)

4.2.3.6 +FMI - Request Manufacturer Identification

This command causes the modem to report the modem product manufacturer as provided by the .INF File.
Syntax

+FMI or +FMI?

Typical Response

Conexant
OK

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4.2.3.7 +FMM - Request Model Identification

This command causes the modem to report the modem product model as provided by the .INF File.
Syntax

+FMM or +FMM

Typical Response

HCF 56K Data, Fax, Speakerphone, PCI Modem
OK

4.2.3.8 +FMR - Request Revision Identification

This command causes the modem to report the modem version, revision level, or date as provided by the .INF File.
Syntax

+FMR or +FMR

Typical Response

1.0
OK

4.2.3.9 +FLO - Flow Control

This parameter allows the DTE to identify and select the type of flow control used.
Syntax

+FLO=<method>

Defined Values

<method> Decimal number corresponding to the selected option.

0 XON/XOFF and RTS/CTS flow control turned off.
1 Use XON/XOFF flow control in either direction.
2 Use RTS for flow control of the modem by the DTE; use CTS for flow control of the DTE

by the modem.

Reporting Current or Selected Values
Command: +FLO?

Response: +FLO: <method>
Example: +FLO: 0 For the default setting.

Reporting Supported Range of Parameter Values
Command: +FLO=?

Response: +FLO: (<method>range)
Example: +FLO: (0-2)

Result Codes

OK <method> = 0-2.
ERROR Otherwise.

4.3 EXAMPLES

Examples of calling (transmitting) and answering (receiving) one page using fax class 1 commands are shown in Table 4-4
and Table 4-5, respectively. The examples show the interchange between the DTE and the modem for various cases.
Comments are included to explain how to handle various situations. Commands and responses are in upper case (e.g.,
AT+FRH=3) and comments are in lower case. All streams of data denoted by <..frame> are terminated by the <DLE><ETX>
characters.

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Table 4-4. Fax Class 1 Calling Sequence (Transmitting a Single Page)

DTE Commands Modem Responses Local Modem Action Remote Station Action Notes

AT+FCLASS=1 OK Set Class 1
ATDT<string>

CONNECT
<NSF frame>
<DLE><ETX>
OK

AT+FRH=3

AT+FRH=3

AT+FRH=3 NO CARRIER detect loss-of-carrier drop carrier
AT+FRH=3

<TSI frame data>
<DLE><ETX>

<DCS frame data>
<DLE><ETX>

AT+FTS=8;
+FTM=96

CONNECT
<CFI frame data>
<DLE><ETX>
OK

CONNECT
<DIS frame data>
<DLE><ETX>
OK

CONNECT

CONNECT

OK

CONNECT

Dial and send CNG
Look for V.21
Detect flags

Detect flags
get CSI
get FCS
accept FCS

Detect flags
get DIS
get FCS
accept FCS

send V.21 carrier
send flags
send TSI frame
send FCS
send flags
send DCS frame
send FCS, flags
drop carrier

wait 80 ms
send V.29 carrier

Answer
send CED, V.21
Send HDLC flags

Send NSF frame

send CSI frame

check FCS Frame status OK

send DIS frame

check FCS

detect carrier
detect flags
get TSI frame

get DCS frame

detect carrier

AT+FRH=3
implied by dialing with
+FCLASS=1.0

DTE must detect final
frame bit to anticipate
loss of carrier

Final frame bit clear tells the
modem to expect another
frame.
Final frame bit set tells the
modem not to expect another
frame

<TCF data pattern>
<DLE><ETX>

AT+FRH=3

AT+FRH=3 NO CARRIER detect loss-of-carrier drop carrier
AT+FTM=96

<page image data>
<DLE><ETX>

AT+FTS=8;
+FRH=3

<EOP frame data>
<DLE><ETX>

AT+FRH=3

AT+FRH=3 NO CARRIER detect loss-of-carrier drop carrier
AT+FRH=3

<DNC frame>

<DLE><ETX>

ATH0 OK hang up hang up

OK

CONNECT
<CFR frame data>
<DLE><ETX>
OK

CONNECT

OK

CONNECT

OK

CONNECT
<MCF frame data>
<DLE><ETX>
OK

CONNECT

OK

send TCF data
drop carrier

detect carrier
detect flags
get CFR frame
check FCS
accept FCS

send V.29 carrier
send page data
drop carrier

wait 80 ms
send V.21 carrier
send flags
send EOP frame
send FCS
drop carrier

detect carrier
detect flags
get MCF frame
check FCS
accept FCS

send V.21 carrier
send flags
send DNC frame
send FCS
drop carrier

get TCF data

send V.21 carrier
send flags
get CRF frame
send FCS

detect carrier
receive page

detect carrier
detect flags
receives EOP

send V.21 carrier
send flags
get MCF frame
send FCS

detect carrier
detect flags
receive DC|NC

Final frame bit set.
frame OK

final frame

Final frame bit set.
frame OK

final frame

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Table 4-5. Fax Class 1 Answering Sequence (Receiving a Single Page)

DTE Commands Modem Responses Local Modem Action Remote Station Action Notes

AT+FCLASS=1 OK Set Class 1

RING<- detect ringing dials [,send CNG]

ATA

<CSI frame data>
<DLE><ETX>

<DIS frame data>
<DLE><ETX>

AT+FRH=3

AT+FRH=3

AT+FRH=3 NO CARRIER detect loss-of-carrier drop carrier DTE did not check final frame

AT+FTM=96

AT+FRH=3

<CFR frame data>
<DLE><ETX>

AT+FTM=96

AT+FRH=3 NO CARRIER detect loss-of-carrier drop carrier
AT+FRH=3

<MCFame data>
<DLE><ETX>

CONNECT

CONNECT

OK

CONNECT
<TSI frame data>
<DLE><ETX>
OK

CONNECT
<DCS frame data>
<DLE><ETX>
OK

CONNECT
<TCF data>
<DLE><ETX>
OK

CONNECT

OK

CONNECT
<page image data>
<DLE><ETX>
NO CARRIER

CONNECT
<EOP frame data>
<DLE><ETX>
NO CARRIER

CONNECT

off-hook,
send CED,
send V.21 carrier
send flags
send CSI frame
send FCS
send flags
send DIS data
send FCS and flags
drop carrier

detect carrier
detect flags
receive TSI
receive FCS
accept FCS

receive DCS
receive FCS
accept FCS

detect carrier
receive TCF
detect loss-of-carrier

send V.21 carrier
send flags
get CRF frame
send FCS
drop carrier

detect carrier
receive page
detect loss-of-carrier

detect carrier
detect flags
receive EOP
receive FCS
accept FCS

send V.21 carrier
send flags
get MCF frame
send FCS
accept FCS

get CED,
detect carrier
detect flags
receive CSI
get FCS
get flags
get DIS
get flags

send V.21 carrier
send flags
send TSI frame
send FCS

send DCS frame
send FCS

wait 75 ms
send V.29 carrier
send TCF data
drop carrier

detect carrier
detect flags
receive CFR

send V.29 carrier
send page data
drop carrier

wait 75 ms
send V.21 carrier
send flags
send EOP frame
send FCS

detect carrier
detect flags
receive MCF frame

AT+FRH=3
implied by answering with
+FCLASS=1.0.
not final frame

final frame

frame OK

final frame bit set

frame OK

bit and issued +FRH=3

final frame

frame OK

OK

AT+FRH=3

CONNECT
<DCN frame data>
<DLE><ETX>

OK
AT+FRH=3 NO CARRIER detect loss-of-carrier drop carrier end of session
ATH0 OK hang up

4-14

detect carrier
detect flags
receive DCN
receive FCS
accept FCS

Conexant

send V.21 carrier
send flags
send DCN frame
send FCS

final frame

frame OK

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5. VOICE COMMANDS

5.1 Voice Commands Overview

Voice commands are identified in Table 5-1.

Command Function

+FCLASS Set Mode
+VCID Caller ID (CID)
+VNH Automatic Hang-up control
+FMI Manufacturer Identif i cation
+FMM Product I dentification
+FMR Vers i on, Revision, etc.
+FLO Flow Control

+VIP Voice Initialize All Parameters
+VRX Start Modem Receive (Record)
+VTR Start Voice Transmission and Reception (Duplex)
+VTS Voi ce Tone Send (Send single frequency or DTMF)
+VTX Start Modem Transmit (Playback)
+VGR Voic e Gai n Receive (Record Gain)
+VGT Voice Gain Transmit (Playback Volume)
+VIT Voice Inactivity Timer (DTE/Modem)
+VLS Analog Source/Destination Selection
+VRA Ringback Goes Away Timer
+VRN Ringback Never Appeared Timer
+VSD Silence Detection (QUIET & SILENCE)
+VSM Com pression Method Selection
+VTD Beep Tone Duration Timer
+VDR Distincti ve Ring
+VDT Control Tone Cadence Reporting
+VBT Buffer Threshold Setting
+VPR Sel ect DTE/modem Interface Rate (Turn off autobaud)

+VSP Speakerphone ON/OFF
+VDX Speakerphone Duplex Mode
+VGM Microphone Gain
+VGS Speaker Gain

Table 5-1. Voice Commands

Configuration

Voice

Speakerphone

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Command Reference Manual

5.1.1 <DLE> Shielded Event Codes Sent to the DTE

Table 5-2 lists the supported <DLE> shielded codes sent to the DTE in the expression <DLE><code>. The number in
parenthesis in the second column corresponds to the T.50 equivalent.

Table 5-2. Supported <DLE> Shielded Codes Sent to the DTE

Code T.50

Equivalent

<DLE> (1/0) Two c ontiguous <DLE><DLE> codes indicat e a single <DLE> in the data stream
<SUB> (1/10) <DLE><DLE> in the data stream
<ETX> (0/3) End Data State

/ (2/15) Start of DTMF t one shielding

~ (7/15) DTMF transitions to off

R (5/2) Ring

1 (3/1) DTMF 1
2 (3/2) DTMF 2
3 (3/3) DTMF 3
4 (3/4) DTMF 4
5 (3/5) DTMF 5
6 (3/6) DTMF 6
7 (3/7) DTMF 7
8 (3/8) DTMF 8
9 (3/9) DTMF 9
0 (3/0) DTMF 0
A (4/1) Extended Keypad DTMF A

B (4/2) Extended Keypad DTMF B
C (4/3) Extended Keypad DTMF C
D (4/4) Extended Keypad DTMF D

* (2/ 10) Ex t ended Keypad DTMF E
# (2/3) Extended K eypad DTMF F
o (6/15) Receive Buffer Overrun
c (6/3) Facsimile Calling
e (6/5) Data Calling
h (6/8) Line Current Break (l ocal phone goes on-hook)

H (4/8) Line Current Detected (local phone goes off-hook)

s (7/3) “P resumed Hangup”(SILENCE) Time-out
q (7/1) “Presumed E nd of Message” (QUIET) Time-out

l (6/12) Loop Current Int errupt ion
b (6/2) BUSY
d (6/4) DIALTONE
u (7/5) Transmit B uffer Underrun
a (6/1) Facsim i l e or Dat a Answer

f (6/6) Data Answer

Event Report Description

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5.1.2 <DLE> Shielded Codes Sent to the Modem (DCE)

Table 5-3 lists the supported <DLE> shielded codes sent to the modem in the expression <DLE><code>. The number in
parenthesis in the second column corresponds to the T.50 equivalent.

Table 5-3. Supported <DLE> Shielded Codes Sent to the Modem (DCE)

Code Code Simple Action Command Description

<DLE> (1/ 0) Two contiguous <DLE><DLE> codes indicate a single <DLE> i n the data stream

("Immediate Command" or "Stream Command").

u (7/5) [Action Numbers 0 and 3] Increase the volum e or gai n by one unit ("Immediate

Command").

d (6/4) [Action Numbers 1 and 4] Decrease the volume or gai n by one unit ("Immediate

Command").

p (7/0) [Action Number 9] Pause.

r (7/2) [Action Number 10] Resume.

<ETX> (0/3) [Action Number 11] End Voice Transmit St ate ("Stream Command").

<CAN> (1/8) [Ac t ion Number 12] Clear transmit buff er of voice data ("Immediate Com m and" ).

! (2/1) [Action Number 15] Receive abort ("Immediate Command").
^ (5/E) End V oi ce Duplex State (see +VTR com m and).

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Command Reference Manual

5.2 Voice Commands

5.2.1 Configuration Commands

5.2.1.1 +FCLASS=8 - Select Voice Mode

+FCLASS=8 selects the Voice Mode. The Voice Mode commands and responses described in this section are applicable
when command +FCLASS=8. (See Section 3.2.1.2 for the definition of the FCLASS command.)

5.2.1.2 +FCLASS=80 - Select VoiceView Mode

+FCLASS=80 selects the VoiceView Mode. The Voice Mode commands and responses described in this section are
applicable when command +FCLASS=80. (See Section 3.2.1.2 for the definition of the FCLASS command.)

5.2.1.3 +VNH - Automatic Hang-up Control

This command enables or disables automatic hangups.
Syntax

+VNH=<hook>

Defined Values

<hook> Decimal number corresponding to the selected option.

0 The modem enables automatic hangups as is normal in other modes.
1 The modem disables automatic hangups usually found in the other non-Voice Modes.
2 The modem disables automatic hangups in the other non-Voice Modes. The modem

performs only a “logical” hangup (returns to OK result code).

Reporting Current or Selected Values
Command: +VNH?

Response: +VNH: <hook>
Example: +VNH: 0 For the default setting.

Reporting Supported Range of Parameter Values
Command: +VNH=?

Response: +VNH: (<hook> range)
Example: +VNH: (0-2)

Result Codes

OK <hook> = 0-2.
ERROR Otherwise.

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5.2.2 Voice Commands

5.2.2.1 +VIP - Voice Initialize All Parameters

This command causes the modem to initialize all voice parameters to their default values.
Syntax

+VIP

Result Code

OK
ERROR If not in Voice Mode.

5.2.2.2 +VRX - Start Modem Receive (Record)

This command causes the modem to start the voice reception process.
Syntax

+VRX<n>

Defined Values

<n> Decimal number corresponding to the selected option.

0 Start receive voice without periodic tone production during a voice receive operation.
1 Start receive voice with periodic tone production during a voice receive operation.

Result Codes

OK <n> = 0 or 1.
ERROR Otherwise, or if not in Voice Mode.

5.2.2.3 +VTR - Start Voice Transmission and Reception (Voice Duplex)

This command causes the modem to start the voice transmission and reception process (Voice Duplex) without either
acoustic echo cancellation or line echo cancellation. The modem begins the Voice Duplex State by returning the CONNECT
result code to the DTE. The modem then sends <DLE> shielded voice data to the DTE, and the DTE can send <DLE>
shielded voice data to the modem. The modem will accept data from the DTE and send data to the DTE in the format
previously selected by the +VSM command, and use the flow control method selected by the +IFC command.

The modem signals termination of the voice data stream by appending a <DLE><ETX> command and padding out to an octet
boundary if needed. The modem will issue the <DLE><ETX> character pair (thereby ending the modem to DTE voice data
flow) followed by the OK result code, and return to the command mode after the modem has completely transmitted the
contents of its buffer.

There are two methods to leave the Voice Duplex State: the DTE sending a <DLE><^> shielded code or the inactivity timer
elapsing in the modem. The Voice Command State is entered upon Voice Duplex State termination.

This command will function when the input and output are from/to the same I/O device, such as local handset, line, or
mic/speaker.

Syntax

+VTR

Result Codes

OK Upon command acceptance.
ERROR The modem is not connected to the line and a non-line device.

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Command Reference Manual

5.2.2.4 +VTS - Send Voice Tone(s)

This command causes the modem to send DTMF digit or hookflash tones with the duration specified by +VTD, to send DTMF
digit or hookflash tones with duration specified by this command, or to send single or dual tone frequencies with duration
specified with this command.

Syntax

+VTS=<string>

Defined Values

<string> The tone generation consists of elements in a list where each element is separated by a comma.

Each element can be:

(1) A single character which the modem interprets as a DTMF digit (0 - 9, #, *, or A-D) or

hookflash (!), with a duration given by the +VTD command.

(2) A 3-element string enclosed in square brackets, "[freq1,freq2,dur]", which the modem

interprets as a general dual tone and duration selection, or

(3) A 2-element string enclosed in curly braces, "{X,dur}", which the modem interprets as a DTMF

digit (0 - 9, #, *, or A-D), or hookflash (!) with a duration (dur) different than that given by the
+VTD command,

Missing subparameters assume the default value. Unspecified values always default to zero for
frequencies, DTMF * for DTMF tones, and +VTD for duration. The omission of commas (and
associated subparameters) are valid.

The quantity in the square brackets consists of a 3-element list (freq1,freq2,dur), which can be used
to send single or dual tones. The first element is the first frequency (freq1) with range 0 or 200-3000
Hz. The second element is the second frequency (freq2), with range 0 or 200-3000 Hz. The third
element is the duration (dur) in 0.01 second intervals with range 0-255 (ASCII units of 10 ms). A list
may contain null elements. For example [3000] means that the DCE generates a single tone at 3000
Hz for the default duration, [3000,3300] means that the DCE generates a dual tone at 3000 and 3300
Hz for the default duration, and [,3300] means that the DCE generates a single tone at 3300 Hz for
the default duration.

The quantity in the curly braces consists of a 2-element list (X,dur), which can be used to send
DTMF tones or hookflash. The first element is the DTMF tone or hookflash (!) character (X), and the
second element is the duration (dur) in 0.01 seconds. The characters are of the same set given
above. A list may contain null elements. For example, {2} means DTMF tone "2" for the default
duration, and {} means silence for the default duration.

The modem will stop the tone generation at the point in the string where the modem detects a
parsing error, encounters an invalid frequency range, encounters a <CR>, or encounters a semi­colon.

Reporting Supported Range of Parameter Values
Command: +VTS=?

Response: (<freq1> range), (<freq2> range), (<dur> range)
Example: (200-3000),(200-3000),(0-255)

OK

Result Codes

OK Valid command.
ERROR The <string> command is invalid, or a selected frequency is out of range.

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