AT&T 1987 User Manual
555-520-200
Issue 1, June 1987
AT&T System 25
Reference Manual
© 1987 AT&T
All Rights Reserved
Printed in USA
TO ORDER COPIES OF THIS DOCUMENT REFER TO DOCUMENT NUMBER 555-520-200.
Contact: Your AT&T sales representative or
Call: 800-432-6600, Monday to Friday between 7:30 am
and 6:00 EST, or
Write: AT&T Customer Information Center
2855 North Franklin Road
P.O. Box 19901
Indianapolis, Indiana 46219
Every effort was made to ensure that the information in this document was complete and accurate at
the time of printing. However, information is subject to change. This document will be reissued
periodically to incorporate changes.
Reference Manual
Prepared by System 25
Document Development Group and the
AT&T Documentation
Management Organization
FCC NOTIFICATION AND REPAIR INFORMATION
AT&T SYSTEM 25
This telephone equipment is registered with the Federal Communications Commission (FCC)
in accordance with Part 68 of its Rules.
following:
MEANS OF CONNECTION
Connection of this telephone equipment to the nationwide telecommunications network shall
be through a standard network interface USOC RJ21X jack. Connection to private line
network channels requires USOC RJ2GX jack for tie lines or USOC RJ21X jack for offpremises station lines.
NOTIFICATION TO THE TELEPHONE COMPANY
If the system is to be connected to off-premises stations (OPSs), you must notify the
telephone company of the OPS class of service, OL13C, and the service order code, 9.OF.
These can be ordered from your telephone company.
In compliance with the Rules, be advised of the
Upon the request of the telephone company, inform them of the following:
—
The Public Switched Network “lines” and the Private “lines” to which you will
connect the telephone equipment.
—
The telephone equipment’s “registration number”
(REN) from the label on the equipment.
—
For private line connections, provide the facility interface code, TL31M for tie lines.
You must also specify the service order code, 9. OF.
—
The quantities and USOC numbers of the jacks required.
—
For each jack, provide the sequence in which lines are to be connected; the type lines
and the facility interface code and the ringer equivalence number by position, when
applicable.
This telephone equipment should not be used on coin telephone lines. Connection to party
line service is subject to state tariffs.
REPAIR INSTRUCTIONS
If you experience trouble with this telephone equipment, contact the AT&T Business
Customer Service Center on 1-800-242-2121. The telephone company may ask that you
disconnect this equipment from the network until the problem has been corrected or until
you are sure that this equipment is not malfunctioning.
and “ringer equivalence number”
RIGHTS OF THE TELEPHONE COMPANY
If your telephone equipment causes harm to the telephone network, the telephone company
may discontinue your service temporarily.
If possible, they will notify you in advance. But
if advance notice isn’t practical, you will be notified as soon as possible. You will be
informed of your right to file a complaint with the FCC.
Your telephone company may make changes in its facilities, equipment, operations, or
procedures that could affect the proper functioning of your equipment. If they do, you will
be notified in advance to give you an opportunity to maintain uninterrupted telephone
service.
HEARING AID COMPATIBILITY
The voice terminals described in this manual are compatible with inductively coupled
hearing aids as prescribed by the FCC.
FCC REGISTRATION INFORMATION
Registration Number
Ringer Equivalence
AS593M-71565-MF-E
0.5A
Network Interface RJ21X or RJ2GX
PRIVATE LINE SERVICE
Service Order Code
9.OF
Facility Interface Code
● Tie Lines TL31M
● Off-Premises Stations OL13C
FCC WARNING STATEMENT
Federal Communications Commission (FCC) Rules require that you be notified of the
following:
● This equipment generates, uses, and can radiate radio frequency energy and, if
not installed and used in accordance with the instruction manual, may cause
interference to radio communications.
● It has been tested and found to comply with the limits for a Class A computing
device pursuant to Subpart J of Part 15 of FCC Rules, which are designed to
provide reasonable protection against such interference when operated in a
commercial environment.
● Operation of this equipment in a residential area is likely to cause interference in
which case the user at his or her own expense will be required to take whatever
measures may be required to correct the interference.
DANGER
The AT&T System 25 cabinets are not user serviceable.
Some voltages inside the cabinets are hazardous. This
equipment is to be serviced only by qualified technicians.
CONTENTS
SECTION l—OVERVIEW
SECTION 2—FEATURES AND SERVICES
SECTION 3—FUNCTIONAL DESCRIPTION
SECTION 4—HARDWARE DESCRIPTION
SECTION 5—TECHNICAL SPECIFICATIONS
SECTION 6—ENVIRONMENTAL REQUIREMENTS
SECTION 7—PARTS INFORMATION
SECTION 8—REFERENCE DOCUMENTATION
SECTION 9—GLOSSARY
SECTION 10—INDEX
SECTION 1—OVERVIEW
This reference manual provides general technical information on AT&T System 25 (System
25). It includes a description of the system, its hardware and software, features and
services, environmental requirements, and technical specifications. This manual is intended
to serve as an overall technical reference for System 25.
This manual replaces AT&T System 25 Reference Manual (555-50-200, Issue 1), which
covered Release 1 Version 1 (RIV1 ) of System 25.
coverage plus complete information on R1V2, a more powerful and versatile configuration of
the system.
particularly in the area of networking.
● The Virtual Facilities addition enhances the customer’s outgoing network
R1V2 provides new features and services that enhance system operation,
Here are some of the improvements:
capabilities.
● The AT&T STARLAN NETWORK (STARLAN NETWORK) Access feature provides
connectivity between System 25 and an associated STARLAN NETWORK.
●
Switched Loop Attendant Console operation makes the handling of incoming calls
from the network more efficient than in RIV1.
● With the Tandem Trunking feature, tie trunks can be used to call through System 25
to reach another switching system (CO or PBX).
● New voice terminals are provided for meeting specific system user needs.
This new issue contains the original
● A new voice feature, Last Number Dialed, is added, and existing voice features are
improved.
●
Data services are enhanced with new options for placing and controlling calls.
Both RIV1 and R1V2 of System 25 are described in this manual. Unless specifically marked
as “VI” or “V2”, all of the information pertains to both versions. VI information applies
only to RIV1 systems; V2 information applies only to R1V2 systems.
Organization
The manual is divided into 10 Sections. The remaining Sections are as follows:
● SECTION 2–FEATURES AND SERVICES
● SECTION 3–FUNCTIONAL DESCRIPTION
● SECTION 4–HARDWARE DESCRIPTION
●
SECTION 5–TECHNICAL SPECIFICATIONS
●
SECTION 6–ENVIRONMENTAL REQUIREMENTS
● SECTION 7–PARTS INFORMATION
● SECTION 8–REFERENCE DOCUMENTATION
● SECTION 9–GLOSSARY
● SECTION 10–INDEX
1-1
System 25 Description
System 25 (Figure l-l) is an advanced digital switching system that integrates voice and
data communications. It not only provides the features of a state-of-the-art PBX, but goes a
step further by allowing data to be switched point-to-point without first being converted to
analog format.
This capability can be used to set up connections between data terminals,
word processors, personal computers, and host computers.
System 25 uses intelligent port circuits equipped with distributed network processor
elements to provide (essentially) nonblocking voice and data switching.
Voice communications features combine traditional telephone features, such as Call Transfer
and Hold, with advanced features, such as Individual and Group Call Coverage, Hands-FreeAnswer On Intercom, and Speed Dialing (see Section 2, “Features and Services”).
Data communications features provide switched data connections supporting transmission of
voice and data over Premises Distribution System wiring. Data connections can be made
between two digital data modules (asynchronous data units), two analog modems, or between
an analog modem and a digital data module.
Release 1 Version 2 (R1V2) also provides access
to STARLAN NETWORKs.
The system has data modules that provide an RS-232 interface for full duplex, asynchronous,
transmission of data up to 19,200 bps, and an integrated 212A-compatible modem pool
resource.
System 25 supports the following:
● Trunk and Network Facilities–Dual Tone Multifrequency (DTMF) and Dial Pulse
Signaling on incoming and outgoing trunks (dial pulse only on DID trunks).
—
Loop Start (LS)
—
Ground Start (GS) (Strongly Preferred over Loop Start in most installations)
—
Tie Trunks (Type I and Type I Compatible E&M, Type V Simplex)
—
Direct Inward Dialing (DID)
● Voice Terminals – Single-Line Touch-Tone, Single-Line Rotary (V2), MET, and
MERLIN®
● Data Facilities
—
Digital Data End Points – RS-232 Interfaces via Asynchronous Data Units
—
Analog Data End Points — Tip/Ring-Type Modem Interfaces
—
STARLAN NETWORK Access (V2 only).
● Networking Capability
—
Tie Trunks
—
Tandem Trunking
—
Endpoint in Electronic Tandem Network (Tributary only, not Satellite)
—
Endpoint of Enhanced Private Switched Communications Services (EPSCS)
—
Endpoint of Tandem Tie Trunk Network (TTTN)
—
Endpoint of Common Control Switching Arrangement (CCSA).
1-2
EMERGENCY
TRANSFER
UNIT
SINGLE-LINE
VOICE
TERMINALS
MULTILINE
VOICE
TERMINALS
DIRECT TRUNK
ATTENDANT
CONSOLE OR
SWITCHED LOOP
ATTENDANT
CONSOLE
ATTENDANT
DIRECT
EXTENSION
SELECTOR
CONSOLE
-48V DC
ANALOG
HYBRID
HYBRID
HYBRID
DIGITAL SWITCH
COMMON
CONTROL
COMPLEX
SWITCHING
NETWORK
(PORTS)
SYSTEM ADMINISTRATION
RS-232C
RS-232C
RS-232C
ANALOG FACILITIES
DATA
ANALOG
TERMINAL
OR
ADVANCED ADMINISTRATION
PC TERMINAL
ASYNCHRONOUS
DATA
UNIT (ADU)
MODEM
TAPE
BACKUP
UNIT
SMDR
OUTPUT
DEVICE
TRUNK FACILITIES
l DID
l
FX, WATS (LOOP/GROUND START)
l TIE
l
CO (LOOP/GROUND START)
l
PAGING SYSTEMS
RS-232C
RS-232C
HOST COMPUTERS
TERMINALS
STARLAN
NETWORK
WORKSTATIONS
STARLAN
NETWORK
PRINT & FILE
SERVICES
STARLAN
NETWORK
HOSTS
STARLAN
NETWORK
GATEWAY
ANALOG
AUXILIARY TRUNKS
Figure 1-1. System 25 Block Diagram
1-3
.
MUSIC SOURCE
. EXTERNAL ALERTS
.
DELAY ANNOUNCEMENT
.
DICTATION EQUIPMENT
.
PAGING SYSTEMS
.
DICTATION EQUIPMENT
Call Handling Capabilities
System 25 can be arranged as a stand-alone system or can be part of a private network. The
system provides 256 ports to support the following:
● 115 simultaneous two-party conversations
● Traffic Handling Capacity of 4140 CCS/Hour (Trunking Limited)
● Busy Hour Call Capacity of 2500 calls (DTMF Register Limited)
● Up to 104 trunk ports including Central Office (CO), DID, Tie, Foreign Exchange
(FX), Wide Area Telecommunications Service (WATS), and 800 Service
● An Auxiliary Trunk interface for paging (Vl and V2) and dictation systems (V2).
● Up to 240 ports that support a combination of the following:
—
Up to 200 ports for voice terminals and auxiliary feature port equipment.
—
Up to 104 data ports providing RS-232C connections to data terminals,
personal or multiport computers.
Refer to Hardware and Software Parameters as provided in “Technical Specifications”
(Section 5) for detailed specifications.
Safety
System 25 meets all requirements found in Underwriters Laboratories Standard for
Telephone Equipment (1459).
Business Communications Needs
The remainder of this Section describes how System 25’s R1V2 features may be used to
satisfy a customer’s communications needs.
This material may be thought of as the reverse
of the “Features and Services” section which follows.
The business communications capabilities of the majority of small businesses with more
than thirty phones are provided by a Private Branch Exchange (PBX). System 25 is a PBX
designed to meet the business communications needs of customers in the 30 to 150 station
range.
The communications needs of most business customers may be broken down into five basic
categories. Customer experience has shown that a PBX needs to provide–
● Prompt handling of incoming calls to maximize revenue opportunities and client
satisfaction,
● Ease of access to and cost control of outgoing calls over public network and private
facilities,
● Easy movement of calls between on-premises phones and between on-premises and
off-premises phones,
● Sharing of data between PCs and/or host computers and data terminals, and
● Growth and rearrangement of facilities.
The following pages outline System 25’s outstanding ability to provide these services.
1-4
Incoming Business Communications
Successful call termination is the key to capturing all incoming communications associated
with revenue issues, client inquiries, decision data, etc. Call termination involves identifying
the called party and routing the call to a primary or secondary answering position. System
25 provides powerful tools for both call screening and call termination.
● Attendant Consoles allow one or two attendants to answer, screen, and steer
incoming calls using either Direct Trunk or Switched Loop operation.
With
attendant operation, incoming calls can be screened and forwarded to the appropriate
party for resolution, messages taken for absent clients, or forwarded to alternate
locations. Calls may arrive over any of the network facilities described in later
sections of these notes.
● Direct Inward Dialing allows incoming callers to reach specific individuals or
facilities without attendant assistance. This allows specific numbers to be advertised
for direct customer access to brokers, emergency services, etc. over a shared pool of
DID trunks.
● Direct Group Calling (DGC) allows incoming calls to be directed to a specific group
of stations.
Calls to a DGC group hunt for an idle station in a circular manner,
starting at the station following the last one called. If all group members are busy,
calls are queued and can be sent to a delay announcement. A DGC group can
terminate calls to sales, services, computer, announcement, etc. over either ordinary
CO trunks or DID trunks.
● Personal Lines provide dedicated outside lines for multiline voice terminal users and
are accessed via a dedicated button for both incoming and outgoing service. Up to
sixteen terminals may share a Personal Line with up to four parties simultaneously
off-hook. A personal line provides direct access to brokers, emergency service, etc.
over a dedicated loop start or ground start trunk.
Frequently, the called party is not available to handle an incoming call. System 25 provides a
number of methods for redirecting incoming calls to alternate resources.
● Call Following allows users who are away from their phone to receive calls at
another phone.
25 voice terminal and receive their calls at that terminal.
Users may login their Personal Dial Code (PDC) at any other System
This feature supports
roving personnel and shared office space for company staff.
● Call Coverage allows calls that are not answered within a specified number of rings
to be redirected to an individual covering station and/or a group of covering stations.
This is especially useful for Boss-Secretary arrangements, staff backup, and message
service.
This feature is versatile enough to permit suitable alternate answering
arrangements for virtually every level of employee. Special features, such as the
Send All Calls feature, which routes a user’s calls directly to covering station(s),
accommodate the day-to-day variations that occur in an employee’s work schedule.
● Station Hunting provides automatic redirection of incoming calls to an idle member
of a hunt group when the called party is busy.
l Call Pickup allows a user to answer a call ringing at another terminal. Directed Call
Pickup allows a user to answer a call ringing at any terminal by dialing the call
pickup code and the PDC of the ringing station.
Group Call Pickup permits calls to
any other terminal in the call pickup group to be answered by dialing the group call
pickup code. With Call Pickup, users do not have to leave their phone to answer
other’s calls. This feature is especially useful for local coverage in group offices not
1-5
supported by secretarial service and equipped with economical single-line phones.
When alternate resources are not available to handle an incoming call, System 25 provides
for attendant handling of the call utilizing camp-on, redirection and/or message service.
● Camp-On allows the attendant to extend an outside call to a busy station. A burst of
tone is heard at the called station to notify the user of the camped-on call. The
caller is placed on hold and hears music-on-hold, if available. When the user hangs
up, the camped-on call begins ringing immediately. Only one call may be camped on
at a time. The Return Coverage on Busy feature returns unanswered camped-on calls
to the attendant for service after a specified interval.
● Return Coverage on Don’t Answer returns unanswered attendant-extended calls for
additional service (redirection/messaging).
● Messaging Service supports activation of an LED at the called station to indicate
that the attendant, message desk, or another station has a message for the user.
Special arrangements are needed to handle incoming calls during periods when the normal
staff is not available, for example at night and on weekends. System 25’s Night Service
feature allows on-duty personnel to answer incoming attendant-seeking calls when the
attendant is not on duty. Directed Night Service redirects incoming attendant-seeking calls
to designated voice terminals, such as a guard desk or coverage position. Trunk Answer
From Any Station allows users to answer incoming calls from any station by dialing the
Night Service access code. Night personnel can be alerted by a Night Bell.
Outgoing Business Communications
One of the key functions of a customer premises communications system is to provide easy
access to the most cost effective network facilities for outgoing calls. The system needs to be
capable of steering calls based on cost, and must also keep records of incoming and outgoing
calls and associated costs. Building on its ground start trunk capability, System 25 features
control costs and record usage as follows.
●
Call Restrictions allow the manager to restrict users from making certain types of
calls. Restriction is administered through outward restriction, toll call restriction,
and facility access restriction.
● Automatic Route Selection provides manager defined routing of calls over the
telecommunications network based on preferred routes (normally the least expensive
route available at the time the call is placed) with capacity for multiple common
carriers and routing through tandem switch points. The user dials a standard DDD
number and the system selects the call route.
●
Station Message Detail Recording (SMDR) generates detailed call information on all
incoming and outgoing calls and sends this information to an output device (PC or
printer).
● Call Accounting Systems provide multiple types of customer reports on
communication costs and usage.
Account Code Entry allows a user to associate calls with an account code for charge-
●
back purposes.
1-6
Ease of access to multiple types of network facilities (provided for minimum cost) is
managed by:
● Automatic Route Selection (ARS) allows the customer to dial a standard DDD
number. ARS selects the preferred route and does any number conversions required
for the facilities selected.
● System 25’s Virtual Facility feature provides convenient and inexpensive access to
OCCs. This feature provides access to OCC facilities over a user specified
physical
facility; dedicated OCC trunks are not needed. Local OCC access numbers and
account codes are automatically added by System 25. System 25’s Virtual Facility
feature is fully integrated with its ARS, Toll Restriction, and SMDR/CAS features.
● Last Number Dialed automatically saves the last number dialed and allows the user
to retry the number without redialing. (Multiline voice terminals only)
● Repertory Dialing allows multiline voice terminal users to store a telephone number
or account and associate that number with a button on their voice terminal.
Pressing a Repertory Dial button is equivalent to dialing the stored number (onetouch dialing).
● System Speed Dialing allows all users to dial 90 selected numbers using three-digit
codes. Users can also program up to seven Personal Speed Dial Numbers which are
accessible only from their terminals. System Speed Dialing can be used by the system
administrator to hide business account codes from users.
● Pooled Facility-Dial Access allows both multiline and single-line voice terminal users
to access a common pool of trunks for outgoing calls by dialing a facility access code,
or, on multiline voice terminals, by pressing a button . This grouping provides
resource pooling which results in better service with a given number of trunks.
● Personal Lines provide dedicated outside lines for multiline voice terminal users.
Personal lines are accessed via a dedicated feature button. Up to sixteen terminals
may share a personal line.
● Third-Party Call Setup allows PCs to set up calls between a System 25 voice/data
terminal and any other facility. A PC application program could use this capability
to retrieve information from a database.
Last Number Dialed, Repertory Dialing and Speed Dialing are also applicable to dialing and
managing internal calls. Personal lines provide both incoming and outgoing service.
Internal Call Movement
Typically, about 40 percent of PBX calls are internal calls, call transfers to another location,
conference of multiple locations, temporarily suspended calls, page to locate the called party,
etc. Rapid placement of internal calls and easy call movement from the answering station to
a new station are supported in System 25 with numerous features.
To provide easy internal call setup, System 25 provides the following features.
● Direct Station Selection (DSS) allows one-button access from a multiline voice
terminal to another voice terminal, a pooled facility, paging zone or DGC group. The
DSS status LED reflects the idle/busy status of the associated termination point.
This feature is used to track and contact frequently called associates.
1-7
Automatic Intercom allows multiline voice terminal users to call each other by use of
●
a dedicated line appearance. A private dedicated path ensures that a path is always
available. This feature is frequently used in Boss/Secretary arrangements.
The Dial Plan for System 25 is based on the concept that, whenever possible, calls
●
should be placed to individuals rather than to pieces of equipment. To implement this
concept, individuals are assigned Personal Dial Codes (PDCs) and are allowed to
login those PDCs at other terminals. The system automatically routes the call to the
home terminal or logged-into terminal.
of reaching the called party.
In addition, the dial plan is built on a flexible
This significantly increases the probability
numbering scheme which allows the number of dialed digits to match assigned PDCs
(2/3/4 digit dial plans) and to be administered to match telephone company assigned
Direct Inward Dialing numbers.
Efficient internal call termination is supported with the following features.
● Distinctive Ringing provides two types of ringing to allow users to distinguish
between outside calls and inside calls,
Hands-Free Answer on Intercom (HFAI) allows Speakerphone and HFAI terminals
●
to auto-answer inside or attendant extended calls. With HFAI active, the set
generates a tone burst over its speaker to alert the calling and called party of the call
completion.
Both parties may then converse;
no action by the called party is
required.
Frequently, the first termination point for a call is not its final destination. To support
internal call movement, System 25 provides the following features.
● Transfer allows a user to transfer any call to another voice terminal. This feature
supports transfer of calls from the answering position to another location for
completion of a transaction. Examples are secretary to boss, office to lab, broker to
specialist, etc.
Conference allows up to five parties (maximum two outside), including the originator,
●
to participate in a call.
This feature supports add-on of additional parties to a call
for joint consultation, crisis management, schedule coordination, etc.
Hold allows a user to suspend a call. The Hold feature allows users to temporarily
●
disconnect from one conversation and either place or answer another call. Music or
information bulletins may be provided to the held party. Called parties frequently
use the hold period to access computer data bases, search categories and/or consult
with others via a second phone call.
● Call Park allows a user to place a call or conference on hold and then pick up the call
from any voice terminal.
The user can page another party to pick up the parked call
or may move to another location and then re-access the call.
Data Communications
Small Business customers have started to integrate PCs into their day-to-day business
operations. Businesses have found a need to access the data bases (sales, inventory,
personnel) in these PCs from more than one location (both on- and off-premises). System 25
data features are specially engineered to enhance a user’s ability to access data from
multiple locations.
System 25 has been designed to help these businesses use their personal
computers, data terminals and host computers more effectively by providing the following
features.
1-8
● Circuit switched data communications up to 19,200 bps (RS232 interface). This
provides circuit switched connections from asynchronous data terminals, PCs, or host
computers to host computers or network facilities. Users can be located and/or
moved to any on-premises office equipped with the standard AT&T four-pair wiring
plan. Thus an asynchronous terminal or PC can have access to multiple host
computers, remote data bases via a modem pool, and a local area network
(STARLAN) via System 25’s STARLAN NETWORK gateway.
● Packet switched data connections at 1 million bps over AT&T’s STARLAN
NETWORK local area network. This provides data transfer between client PCs and
servers (PCs/host computers/printers, etc.) on the local area network (LAN). LAN
users can be located and/or moved to any on-premises office equipped with standard
AT&T four-pair wiring.
The LAN allows PCs to share facilities (printers, disk
systems, modem pools, etc.)
● System 25’s STARLAN NETWORK ACCESS software and STARLAN NETWORK
gateway provide access to the STARLAN NETWORK for off-premises and occasional
on-premises users. These users do not need to install a Network Access Unit (NAU)
in their PCs to use the STARLAN NETWORK ACCESS software. The data transfer
rate is limited to 9600 bps or, for off-premises users, by the modem.
LAN users can access hosts connected to System 25, or, if their System 25 is equipped
with a modem pool, remote hosts.
Finally, terminals and PCs connected to System 25
data ports can access host computers on the LAN.
Frequently a user needs to access a LAN data base at or from a remote location (home,
motel, client office, branch, etc.). To support out-of-building access to computer data over
network facilities or OPS lines, System 25 provides the following features.
Modem pooling allows data terminals to communicate over analog facilities utilizing
●
the standard dialing plan and provides full access to all network facilities, cost
control
mechanisms, ARS, and
incoming
call
management
tools
(DID/attendant/DGC, etc.).
● Transfer to data allows a data call to be set up on a voice terminal and then be
transferred to a data terminal or computer.
This feature can also be used to enter an
account code for the data call.
The System 25 STARLAN NETWORK gateway allows the LAN environment to be
●
extended to occasional users or remote locations.
Off-premises users can access the
LAN utilizing all the network features, cost control mechanisms, and incoming call
management facilities of System 25.
The data transfer rate is governed by the
modem.
Setting up data communications with PCs, host computers, and/or remote access can be a
source of confusion for occasional users.
Special data features are provided by System 25 to
assist the user in utilizing its rich set of data communications capabilities.
The integrated voice-data dialing plan recognizes the different types of data
●
endpoints (digital/ analog and remote/local) in a connection and automatically
inserts the required data communication equipment.
In addition, autobauding
supports the alignment of equipment with the capacity to transmit at different data
rates.
● Station Hunting supports the use of a single dial code to access a group of host
computer ports.
1-9
●
Terminal Dialing provides the user with fast access to data communications via
keyboard dialing at a terminal or PC.
●
Command Mode provides a menu of data services supporting terminal dialing, and
display and control of user data port options.
A user friendly Change Options menu
is provided for user administration of data options.
Expert Mode is an enhancement that provides an alternative method of accessing
●
Command Mode functions. Expert Mode eliminates the display of menus and allows
multiple commands to be entered on a single line.
Expert mode lends itself well to
computer-driven scripts for call setup.
●
Communication Access Manager (CAM) is an MS-DOS* software application that
provides a phone manager for placing voice and data calls for the user and VT100†
terminal emulation.
CAM may be used on either STARLAN NETWORK client
workstations or on PCs connected to System 25. CAM has a 200-entry directory with
one-touch dialing for both voice and data calls and auto-login capability for data calls
to host computers.
CAM’s Remote Access feature provides password protected
unattended access to PC files and electronic mail. File transfer is supported with the
popular XMODEM protocol.
●
STARLAN NETWORK ACCESS is an MS-DOS application that allows PCs not
connected to the STARLAN NETWORK to call through the System 25 STARLAN
NETWORK Interface and run STARLAN NETWORK client software to access file
and printer servers on the STARLAN NETWORK. ACCESS uses a PC’s serial
communications port to communicate with the STARLAN NETWORK Interface.
ACCESS is compatible with NETBIOS, permitting execution of most applications
written for the IBM‡ PC Network and IBM Token Ring Network.
Growth & Rearrangement
Historical data indicates that clients in the System 25 station range have a need for
communications systems capable of significant growth and rearrangement. Clients need
flexibility over the life of the system to easily add capacity, move stations, modify cost
control options, etc.
The architecture of System 25 was implemented with the objective of
meeting this need.
Advanced Administration (optional) is an easy-to-use, menu driven personal computer
●
software package for configuring the rich set of system options.
● Uniform Wiring Plan (four-pair) allows a building to be prewired for the rich set of
AT&T Small Business PBX service offerings. This modular wiring plan supports client
reconfiguration of an office with variations in station type (Analog, MET, MERLIN,
futures) and data configurations (LAN, asynchronous, synchronous). It supports
simultaneous voice and data from standard four-pair modular jacks.
●
System 25/75/85V2 Standard Architecture supports efficient growth with modular
cabinets, universal carrier slots, non-blocking network and uniform wiring plan. (See
* Registered trademark of Microsoft Corp.
† Trademark of Digital Equipment Corp.
‡ Trademark of International Business Machines Corp.
1-10
Figures 1 and 2.) Every circuit slot in the system can be used for trunk cards or
voice/data station cards. All these attributes allow the client to add future capability
without breakage and re-engineering of existing equipment. Thus, the client is able to
minimize initial investment while not restricting future growth.
Over time, the type of tools and facilities that a business utilizes changes. It is important
that a PBX provide support for the full set of Telco network options over its installed life,
even when only a subset is initially used. Trunks link two switching systems, such as System
25 and the local Central Office or System 25 and another PBX. System 25 supports five
different telephone company trunk interfaces to provide desired connectivity at minimum
expense.
Thus the opportunity exists to select the best trunk types, depending on tariffs and
customer needs.
● Loop Start (LS) trunks for public network access at minimum tariff. These trunks
handle outgoing and incoming attendant calls, incoming DGC calls, outgoing pooled
facility calls, and personal line calls.
● Ground Start (GS) trunks for public network access. These trunks handle the same
type of calls as LS trunks. They provide protection against call reorigination without
toll restriction, more reliable automatic route selection, virtual facilities, SMDR and
CAS. Simultaneous incoming and outgoing call seizure of the same trunk under
heavy traffic conditions is essentially eliminated with ground start trunks. GS
trunks should usually be selected in preference to LS trunks unless tariff
considerations are overriding.
Note, however, that Centrex Service requires LS
trunks.
● Direct Incoming Dial (DID) trunks for dialing a station directly from outside
(attendant assistance not required). Outside dial access to stations, trunks (optional),
and answering groups (Direct Group calling) is provided.
● Tie Trunks for linking PBXs with dedicated private circuits for high volume calling.
Dial access to stations, other trunks, answering groups (Direct Group Calling) and an
Electronic Tandem Network endpoint capability are provided.
● Off-Premises Stations (OPS) allow a single-line voice terminal to be located remotely
and connected to System 25 via arrangements with the local Telco. This service is
used to provide users at secondary sites (or their residences) many of the same
features as an on-premises single-line station.
To enhance the usage and control of the above set of network facilities, System 25 provides
the rich set of access features outlined in the Outgoing Business Communications Section. In
addition, System 25 can support networking between systems by:
. Serving as an endpoint on an electronic tandem network (ETN) using its tie trunks
and flexible dialing plan.
. Serving as an off-network or on-network access point with its dial access/transfer
between tie-trunks and Telco trunks (LS/GS/DID). This allows usage of tie trunks
to reach a distant System 25 and then connect through that System 25 to local Telco
facilities to complete the call.
To support efficient utilization of trunks, they can be grouped together (up to 16 groups) if
all trunks in the group perform the same function. This resource pooling provides better
service with a given number of trunks, and simplifies administration and calling.
1-11
Types of trunks which can be assigned in System 25 are:
● Central Office, which provide a link with the local telco for incoming and outgoing
calls (LS/GS)
Foreign Exchange (FX), which connect to a CO other than the local CO for high
●
volume calling from a distant location
● Wide-Area Telecommunications Service (WATS), which connect to an Outward
WATS office or a dial “800” Service Office
Direct Inward Dial (DID), which provide incoming service from a CO to directly
●
access a station or facility (STARLAN NETWORK interface, trunk group)
Tie trunks, which provide a link with another private switching system.
●
To support efficient utilization of this rich set of network options, System 25 provides the
functions outlined in the Outgoing and Incoming Business Communications sections.
Conclusions
System 25 has been targeted at providing excellent small business communications capability
at the right price. The thousands of systems in service in the first year of production have
confirmed that these capabilities are an excellent match with small business customers’
communications needs.
1-12
LIST OF FIGURES
Figure 2-1.
Figure 2-2.
Figure 2-3.
Figure 2-4. Console Buttons and Display . . . . . . . . . . . . . . .
Figure 2-5. Switched Loop Attendant Console Connections . . . . . . . . .
Figure 2-6.
Figure 2-7.
Figure 2-8.
Figure 2-9.
Figure 2-10. Typical SMDR Call Detail Report . . . . . . . . . . . . .
Figure 2-11. SMDR Call Record Format . . . . . . . . . . . . . . . .
Figure 2-12. SMDR Call Record Header Format . . . . . . . . . . . . .
Figure 2-13. SMDR Output Equipment or Call Accounting System—On-Premises
Figure 2-14. SMDR Output Equipment or Call Accounting System—On-Premises
Figure 2-15. SMDR Output Equipment–On-Premises Switched
Direct Trunk Attendant Console . . . . . . . . . . . . . .
Direct Trunk Attendant Console Connections . . . . . . . . .
Switched Loop Attendant Console . . . . . . . . . . . . .
Model 23A1 Attendant Direct Extension Selector Console . . . . .
Attendant Direct Extension Selector Console Connections . . . . .
Automatic Route Selection Flow Chart . . . . . . . . . . .
Automatic Route Selection Routing Pattern . . . . . . . . . .
Direct Connections (Sharing Same AC Outlet) . . . . . . . . .
Direct Connections (Greater Than 50 Feet From System
Cabinet) . . . . . . . . . . . . . . . . . . . . . .
Connections . . . . . . . . . . . . . . . . . . . . .
2-13
2-16
2-17
2-20
2-24
2-26
2-28
2-54
2-59
2-69
2-70
2-71
2-72
2-73
2-74
Figure 2-16. SMDR Output Equipment—Off-Premises Direct Connections . . . .
Figure 2-17. SMDR Output Equipment–Off-Premises Switched
Connections . . . . . . . . . . . . . . . . . . . . .
Figure 2-18. Communications Access Manager Architecture . . . . . . . . .
Figure 2-19. Asynchronous Data Unit Interface Signals . . . . . . . . . .
Figure 2-20. Dictation System Connections (FCC Registered) . . . . . . . .
Figure 2-21. Digital Tape Unit . . . . . . . . . . . . . . . . . . .
Figure 2-22. Digital Tape Unit–On-Premises Direct Connections (Sharing Same AC
Outlet) . . . . . . . . . . . . . . . . . . . . . .
Figure 2-23. Delay Announcement Equipment Connections (FCC
Registered) . . . . . . . . . . . . . . . . . . . . .
Figure 2-24. External Alert Connections . . . . . . . . . . . . . . .
Figure 2-25. Supplemental Alert Adapter Connections . . . . . . . . . . .
-iv-
2-75
2-76
2-99
2-107
2-119
2-120
2-121
2-126
2-140
2-141
Figure 2-26.
500A/502A Headset Adapter . . . . . . . . . . . . . . .
2-146
Figure 2-27.
Figure 2-28.
Figure 2-29.
Figure 2-30.
Figure 2-31.
Figure 2-32.
Figure 2-33.
Figure 2-34.
Figure 2-35.
Figure 2-36.
Figure 2-37.
Figure 2-38.
Typical Headset Adapter Connections For 7300H Series Multilane Voice
Terminals (Except 34-Button Deluxe, BIS, or BIS with
Display) . . . . . . . . . . . . . . . . . . . . . .
Typical Headset Adapter Connections For 34-Button Deluxe, BIS, or
BIS with Display Voice Terminals . . . . . . . . . . . . .
Typical Headset Adapter Connections For 12-Button MET
Sets . . . . . . . . . . . . . . . . . . . . . . .
Music-On-Hold Equipment Connections (FCC Registered) . . . . .
Music-On-Hold Equipment Connections (Non-Registered) . . . . .
Delay Announcement Equipment Connections (FCC
Registered) . . . . . . . . . . . . . . . . . . . . .
Paging Equipment Connections Using CO Trunk Ports (FCC
Registered) . . . . . . . . . . . . . . . . . . . . .
Paging Equipment Connection to TN763 Causing 278A
Adapter . . . . . . . . . . . . . . . . . . . . . .
10B Emergency Transfer Unit (ETU) . . . . . . . . . . . .
Emergency Transfer Unit Connections . . . . . . . . . . . .
Multiple ETU Arrangements . . . . . . . . . . . . . . .
Speakerphone Adjuncts . . . . . . . . . . . . . . . . .
2-147
2-148
2-149
2-168
2-169
2-174
2-179
2-180
2-191
2-192
2-193
2-208
Figure 2-39.
Figure 2-40.
Figure 2-41.
Figure 2-42.
Figure 2-43.
Figure 2-44.
Figure 2-45.
Figure 2-46.
Figure 2-47.
Figure 2-48.
Figure 2-49.
Figure 2-50.
Figure 2-51.
Speakerphone Connections For 7300H Series Multilane Voice Terminals
(Except 34-Button Deluxe) . . . . . . . . . . . . . . . .
Speakerphone Connections For 34-Button Deluxe Multiline Voice
Terminals . . . . . . . . . . . . . . . . . . . . .
Speakerphone Connections For 12-Button MET Sets . . . . . . .
STARLAN NETWORK and System 25 Configuration . . . . . . .
STARLAN NETWORK Connection to System 25 (With 2500 Single-
Line Telephone) . . . . . . . . . . . . . . . . . . .
STARLAN NETWORK Connection to System 25 (With ATL-Type
Telephone) . . . . . . . . . . . . . . . . . . . . .
Model 703 System Administration Terminal . . . . . . . . . .
SAT On-Premises Direct Connections (Sharing Same AC
Outlet) . . . . . . . . . . . . . . . . . . . . . .
SAT On-Premises Direct Connections (Greater Than 50 Feet From
System Cabinet) . . . . . . . . . . . . . . . . . . .
SAT On-Premises Switched Connections . . . . . . . . . . .
SAT Off-Premises Direct Connections . . . . . . . . . . . .
SAT Off-Premises Switched Connections . . . . . . . . . . .
Command Mode Menu Tree . . . . . . . . . . . . . . .
2-209
2-210
2-211
2-216
2-219
2-220
2-228
2-229
2-230
2-231
2-232
2-233
2-254
- v -
TABLE 2-A. System Features . . . . . . . . . . . . . . . . . . .
TABLE 2-B. Network Features . . . . . . . . . . . . . . . . . .
TABLE 2-C. Data Features.. . . . . . . . . . . . . . . . . . .
TABLE 2-D. Station Features . . . . . . . . . . . . . . . . . . .
TABLE 2-E. Attendant Features . . . . . . . . . . . . . . . . . .
TABLE 2-F. Partial List of Permissible Data Port (TN726) Options . . . . . .
2-2
2-3
2-3
2-4
2-5
2-97
TABLE 2-G. Typical Option Profiles for Different Types of Data Port
Endpoints . . . . . . . . . . . . . . . . . . . . .
TABLE 2-H. Call Progress Messages for Data Terminal Dialing . . . . . . .
TABLE 2-I. LED Indications . . . . . . . . . . . . . . . . . . .
TABLE 2-J. User Changeable Options . . . . . . . . . . . . . . . .
2-98
2-114
2-157
2-253
-vi-
SECTION 2—FEATURES AND SERVICES
This section describes the System Features,
Network Features, Data Features, Station
Features, and Attendant Features of AT&T System 25. It also covers certain services that
support and implement the features; included in this category are the digital tape unit, the
dial plan, system administration, and system maintenance. A general discussion of data
topics is also provided.
The feature descriptions are arranged in alphabetical order, regardless of the feature group
to which they belong.
Information for each feature is presented under five headings:
Description, Considerations, Interactions, Administration, and Hardware Requirements.
● Description
Defines the feature, describes what it does for the user, and how it is used.
● Considerations
Discusses the applications
and benefits of the feature, followed by feature
parameters and factors to be considered when the feature is used.
● Interactions
Lists and briefly describes other features that can affect the feature being described.
Interacting features are those that:
—
Depend on each other—One of the features must be provided if the other one
is.
—
Cannot coexist–One of the features cannot be provided if the other one is.
—
Affect each other–The operation of one feature modifies, or is modified by,
the operation of the other.
—
Enhance each other—The features, in combination, provide improved service
to the user.
● Administration Requirements
States whether or not administration is required and lists items requiring
administration.
● Hardware Requirements
List any additional hardware needed to use the feature.
Tabular listings of features by group (System,
immediately follow this introduction.
Each type, standard, or optional of the feature, is also
Network, Data, Station, or Attendant)
noted on these lists:
● Standard features—Built into each system (always provided but can require
administration to make them operational)
● Optional features–Such
as Music-On-Hold, require both administration and
additional hardware.
Features restricted to single-line or multiline voice terminals are noted where applicable.
The MET sets operate the same way as 5-button 7300H series voice terminals, unless
otherwise noted.
2-1
System Features
System features (Table 2-A) are those that affect the entire operation of the system. All
system features are available with both Vl and V2.
TABLE 2-A. System Features
FEATURE NAME
FEATURE
TYPE *
Call Accounting
Dial Plan S
Dictation System Access
Digital Tape Unit
Direct Group Calling
Direct Group Calling Delay Announcement
End-to-End Signaling
Extended Stations
External Alerts
Intercept Treatment With Reorder Tone
Interdigit Timeouts
Music-On-Hold
Night Service (Directed and TAAS )
Night Service Delay Announcements
Out-Of-Building Stations
Paging System Access
Personal Dial Codes
Pooled Facility-Dial Access
Power Failure Transfer
Remote Administration Interface
Station Message Detail Recording
System Administration
System Maintenance
Touch-Tone and Dial Pulse Service
S/O†
O
O
O
S
O
S
O
O
S
S
O
O
O
O
S
S
O
O
O
O
S
S
* Feature types: S= Standard; O= Optional (requires additional equipment).
† S/O - Standard for Directed, Optional for TAAS Night Service.
2-2
Network Features
This group of features (Table 2-B) supports communications with the public network and
with other locations in the private network of which System 25 can be a part.
TABLE 2-B. Network Features
FEATURE NAME
FEATURE
TYPE *
Automatic Route Selection
Direct Inward Dialing
Off-Premises Stations
Tandem Trunking (V2)
Tie Trunks
Trunk Groups
Virtual Facilities (V2)
S
O
O
O
O
S
S
Data Features
Data Features (Table 2-C) support the switched data services of the system. Data services
provide switched connections between analog and digital data endpoints.
TABLE 2-C. Data Features
FEATURE NAME
MULTILINE TERMINAL
BUTTON LABEL †
FEATURE
TYPE *
Command Mode
Communications Access Manager (V2)
Data Call Setup
Data Services Overview
Data Terminal Dialing
Expert Mode (V2)
Modem Pooling
AT&T STARLAN NETWORK Access (V2)
Third-Party Call Setup (V2)
Transfer to Data
User Changeable Options (V2)
[DATA]
S
O
S
S
S
O
O
S
S
S
* Feature types: S= Standard; O= Optional (requires additional equipment).
† Bracketed items are associated voice terminal feature button labels;
these labels are also used in feature descriptions where applicable.
2-3
Station Features
The many Station Features (Table 2-D) available allow individual user needs to be met. As
these needs change, assigned features can also be changed.
Station Features provide many
important services that help save time and make calling more convenient.
TABLE 2-D. Station Features
FEATURE NAME
Account Code Entry
Automatic Intercom
Busy-to-Idle Reminder
Call Accountability
Call Coverage-Group
Call Coverage-Individual
Call Following (Forwarding)
Call Park
Call Pickup
(’all Progress Tones
Calling Restrictions
Conference
Conference Drop
Direct Station Selection (DSS)
Distinctive Ringing
Exclusion
Hands-Free-Answer On Intercom
Headset Adapter Adjunct
Hold
Last Number Dialed (V2)
Line Selection
Line Status And I-IJse Indications
Manual Signaling
Messaging Services
Personal Lines
Pooled Facility-Button Access
Program
Recall
Repertory Dialing
Send All Calls
Speaker (Spokesman Service)
Speakerphone Adjunct
Speed Dialing
Station Hunting
Station-To-Station Message Waiting
Test
Transfer
Trunk-To-Trunk Transfer
SINGLE-LINE MULTILINE TERMINAL FEATURE
TERMINAL
x [ACCT ENTRY] s
x
x [COVER-GRP]
x
x x s
x x s
x x s
x
x x s
x x s
x s
x
x x
x s
x
x x
x
x x
x
x
x x s
x x s
BUTTON LABEL † TYPE*
[AUTO ICOM] s
x s
x
[COVER-IND]
x s
[DSS or FLEX DSS]
x
[EXCLUSION] s
[AIJTO ANS] o
[LAST # DIALED]
x
[SIGNAL] s
x
[PERS LINE]
[FACILITY]
x
[REP DIAL] s
[SEND ALL CALLS] s
x s
x
[MSG WAIT] s
x
s
s
s
s
s
o
s
s
s
s
s
s
s
s
o
s
s
s
* Feature types: S= Standard; O= Optional (requires additional equipment).
† Bracketed items are associated voice terminal feature button labels;
these labels are also used in feature descriptions where applicable.
2-4
Attendant Features
Attendant Features (Table 2-E) are available to the attendant using the Direct Trunk
Attendant Console (DTAC) or the Switched Loop Attendant Console (SLAC) (V2 only) and
(optionally) a Direct Extension Selector Console.
In addition, most multiline voice terminal
station features are available to the attendant.
TABLE 2-E. Attendant Features
FEATURE NAME
CONSOLE BUTTON
LABEL
Attendant Call Extending [START]
Attendant Camp-On
Attendant Cancel
Attendant Console, Direct Trunk
Attendant Console, Switched Loop (V2)
Attendant Display (V2; SLAC only)
Attendant Direct Extension Selection
Attendant Forced Release V2; SLAC only)
Attendant Join (V2; SLAC only) [JOIN]
Attendant Message Waiting (DTAC)
Attendant Message Waiting (SLAC)
Attendant Position Busy
Attendant Release
Attendant Return-Coverage-on-Busy [RTN-BUSY]‡
Attendant Return-Coverage-on-Don’t-Answer
Attendant Source/Destination (V2; SLAC only)
Attendant Splitting One-Way Automatic
Attendant System Alarm Indication [ALARM]
Message Center-Like Operation (V2; SLAC only)
Night Service [NIGHT]
[CANCEL]
[FORCED RELEASE]
[ATT MSG]
[ATTENDANT
MESSAGE WAITING]
[POS BIJSY]
[RELEASE]
[RTN-DA]‡
[SOURCE]
[DEST]
FEATURE
†
TYPE *
S
S
S
O
O
S
O
S
S
S
S
S
S
S
S
S
S
S
S
S
S
Feature types: S=Standard; O=Optional.
*
Bracketed words are the labels for button-activated features;
†
these labels are also used in feature descriptions where applicable.
This button is assigned on the DTAC only.
‡
2-5
ACCOUNT CODE ENTRY
Description
Allows voice terminal users to associate an account code with incoming and outgoing calls.
This is accomplished by entering the account code at the voice terminal before hanging up.
The account code is appended to the SMDR call record and can be used later for accounting
or billing purposes.
To association account code with a call, the user, after completing a call but before hanging
up, must:
● Single-Line Voice Terminal User:
—
Flash the switchhook and dial *O; then dial the account code directly or dial a
System or Personal Speed Dial Number that contains the account code. If the
number is entered incorrectly, redial
*0 and the correct number before
hanging up.
● Multilane Voice Terminal User:
—
Press Account Code Entry (ACCT ENTRY) button and then dial the account
code directly or dial a System or Personal Speed Dial Number that contains
the account code. A Repertory Dial (REP DIAL) button can also be used to
enter an account code.
If the number is dialed incorrectly, press ACCT
ENTRY again (before hanging up) and dial the correct number.
● When the correct number of account code digits have been entered (o r# is entered to
signal end-of-dialing), Confirmation Tone followed by Dial Tone is returned to the
user and the account code is appended to the SMDR call record.
Account Code Entry is optional.
Considerations
Account Code Entry provides an easy method of allocating the costs of specific calls (and
associated staff time) to the correct project, department or user. The account code is
appended to the SMDR call record and sent to the SMDR output channel.
Account Codes can include up to 15 digits.
The validity of the entered account code is not checked by the system.
If the user is active on a call, invoking the feature will drop the call.
Incorrectly dialed codes (prior to last digit entry) can be corrected by dialing *0 or pressing
ACCT ENTRY and reentering the code.
before completing entry are recorded and cannot be corrected.
If, before all digits have been entered, (1) the user goes on-hook, (2) a button other than
ACCT ENTRY is pressed, or (3) 30 seconds have elapsed since the feature was invoked, the
SMDR call record will show the digits dialed up to that point.
If a call is on hold, this feature cannot reinvoked.
Partial account codes entered by going on-hook
2-6
Interactions
● Conference: If more than one user attempts to enter an account code on a
Conference Call, the first to enter a code will prevail.
Repertory Dialing: An Account Code can be stored on a REP DIAL button. Press
●
REP DIAL after ACCT ENTRY has been pressed.
Speed Dialing: An Account code can be stored in System or Personal Speed Dial
●
Number.
Transfer: A user can transfer a call to another user, then, before hanging up, enter
●
an account code. Subsequent account code entries for the same call will be ignored,
even though confirmation tone has been returned.
Administration Requirements
System:
● Maximum number of Account Code digits (0-15)--Default = 15.
Voice Terminal: (Station Port)
Multiline terminals–Account Code Entry Button is required.
●
● Single-line terminals–none.
Hardware Requirements
Requires an RS-232 compatible 80-column ASCII (serial) printer or other device to output
Station Message Detail Recording (SMDR)/Account Code entries.
2-7
ATTENDANT CALL EXTENDING
Description
Allows the attendant to put a call in a special hold condition, call another station, then
connect the two calls together.
separate the call from the console or remain connected to the other parties. Attendant Call
Extending is a feature used at either a Direct Trunk Attendant Console (DTAC) or a
Switched Loop Attendant Console (SLAC).
The attendant can withdraw from the connection and
Note: In general, the attendant
the standard multiline voice terminal Transfer feature, to extend calls. If Transfer is
used, busy or unanswered calls cannot return to the attendant console for further
handling.
The attendant, after placing or answering a call, can use Step 1 or 2 to extend this call to an
inside extension or Step 1 to extend it to an outside number:
1. Press START to place the incoming call on hold via the Attendant Splitting OneWay Automatic feature.
requested inside or outside number.
or
2. Press the Selector Console Group Select and Direct Extension Selection (DXS)
buttons associated with the requested inside station. This operation is equivalent to
pressing START and dialing the extension.
If ringing tone is heard, the attendant presses RELEASE (Manual Release) to connect the
caller to the ringing line and separate the call from the console. As an alternative, the
attendant can press any facility button such as System Access, Automatic Intercom, or an
outside line (Attendant Automatic Release) to complete the call extending procedure.
The attendant has the option of staying connected to the ringing line to announce the call
before connecting the two parties.
other parties in a 3-way connection by using the Attendant Join feature.
should not use the TRANSFER button, which invokes
After receiving Dial Tone, the attendant then dials the
The attendant can then release or (SLAC only) join the
If busy tone is heard and Attendant Camp-On (see associated feature description) is not
desired, the attendant presses CANCEL and is reconnected to the calling party.
If busy tone is heard on a call to an inside station and Attendant Camp-On is desired, the
attendant presses RELEASE or any facility button.
the call waits at the called voice terminal. When a busy single-line station goes on-hook, or
a busy multiline station System Access button becomes idle, the call automatically begins
ringing at the station. Only one Camped-On call is permitted per voice terminal.
Calls extended to an
to the Attendant Console on an idle LOOP button (SLAC only) or on the Return-On-Don’t-
Answer (RTN-DA) button (DTAC only). Calls camped-on at a
not answered within a specified time return to the Attendant Console on an idle LOOP
button (SLAC only) or on the Return-On-Busy (RTN-BUSY) button (DTAC only). If a SLAC
is not available to incoming calls (busy on another call, in Position Busy mode, etc.), a
returning call remains in the console queue until the console can handle it. If the Return
buttons on a DTAC are busy, an extended call remains at the called terminal until that
button becomes idle.
idle voice terminal that are not answered within a specified time return
2-8
The called party hears a tone burst, and
busy voice terminal that are
Considerations
Attendant Call Extending allows the attendant to utilize the additional attendant related
features such as Attendant Splitting One-Way (automatically places incoming canon hold),
Release, Cancel, Return-On-Don’t-Answer,
Return-On-Busy, Forced Release (SLAC), Join
(SLAC), and Source/Destination (SLAC).
Interactions
Refer to the other Attendant Feature descriptions for information on related features (Table
2-E).
Administration Requirements
System:
● Number of seconds before a Camped-On call returns to the Attendant Console (1-120
seconds), or No Attendant Camp-On (0) - Default = 30 seconds
Number of rings before unanswered call returns to the Attendant Console (1-31) -
●
Default = 5.
Hardware Requirements
Selector Console (optional)
2-9
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