ELTEX SMG-4, SMG-2 Operation Manual

Digital gateway

SMG-4, SMG-2

Operation manual, version 2.4 (15/06/2017)

Firmware version: 3.1.6.1189

2 SMG digital gateway

Firmware version V.3.1.6.1189
SIP adapter version V.3.1.6.67

Document version

Issue date

Revisions

Version 2.4

15/06/2017

Updated:

– encoding settings and configuration of methods of subscriber name

transmission in Q.931

Added:

– insert remote name in Contact header
– SS7 channels transit via semi-permanent connection
– name transmission using AVAYA, Siemens, Windows-1251 encodings,

Translit and Unicode (UTF-8).

– name transmission methods: QSIG, Q.931 Display, CorNet and AVAYA

Display

Version 2.3

15/08/2016

Time zones updated.
New features added:

- STUN server parameters,

- public IP settings,

- Clear Channel (CLEARMODE) settings,

- English language.

Version 2.2

05/04/2016

Support added for routing modes configuration during trunk registration for
SIP interfaces.

Version 2.1

26/11/2015

SIP interfaces registration added.

Version 2.0

22/06/2015

Second issue.

Version 1.0

12/08/2014

First issue.

SMG digital gateway 3

EXPLANATION OF THE SYMBOLS USED

Symbol

Description

Calibri

Notes, warnings, chapter headings, titles, and table titles are written in bold.

Calibri

Italic denotes important information that requires special attention.

Courier New

Courier New is used for command entry examples, command execution
results, and program output data.

<KEY>

Keyboard keys are written in upper-case and enclosed in angle brackets.

Analogue phone unit.

SMG digital gateway.

Softswitch ECSS-10 software switch.
Digital subscriber PBX.

Network connection.

Optical transmission medium.

Notes and Warnings

Notes contain important information, tips, or recommendations on device operation and
setup.

Warnings inform users about hazardous conditions, which may cause injuries or device
damage and may lead to the device malfunctioning or data loss.

4 SMG digital gateway

TARGET AUDIENCE

This operation manual is intended for technical personnel in charge of gateway configuration and

monitoring using the web configurator, as well as of installation and maintenance. Qualified technical personnel

should be familiar with the operation basics of the ТСР/IP & UDP/IP protocol stacks and Ethernet networks

design concepts.

SMG digital gateway 5

TABLE OF CONTENTS

EXPLANATION OF THE SYMBOLS USED ........................................................................................................... 3

TARGET AUDIENCE .......................................................................................................................................... 4

TABLE OF CONTENTS ....................................................................................................................................... 5

INTRODUCTION ............................................................................................................................................... 7

1 DEVICE DESCRIPTION ................................................................................................................................. 8

1.1 Purpose ............................................................................................................................................... 8

1.2 Typical Applications ............................................................................................................................ 9

1.2.1 Interface for TDM and VoIP Network Signalling and Media Streams ....................................... 9

1.3 Device Design and Operating Principle ............................................................................................ 10

1.4 Main Specifications ........................................................................................................................... 12

1.5 Design ............................................................................................................................................... 14

1.6 LED Indication ................................................................................................................................... 15

1.7 The F Function Button ...................................................................................................................... 18

1.8 Delivery Package ............................................................................................................................... 19

1.9 Safety Instructions ............................................................................................................................ 20

1.9.1 General Guidelines .................................................................................................................. 20

1.9.2 Electrical Safety Requirements ............................................................................................... 20

2 SMG INSTALLATION .................................................................................................................................. 21

2.1 Startup Procedure............................................................................................................................. 21

2.2 Opening the Casing ........................................................................................................................... 21

2.3 RTC Battery Replacement ................................................................................................................. 22

3 GENERAL GUIDELINES FOR GATEWAY OPERATION ................................................................................. 23

4 DEVICE CONFIGURATION ......................................................................................................................... 24

4.1 SMG Configuration via web Interface .............................................................................................. 24

4.1.1 System Parameters ................................................................................................................. 26

4.1.2 Monitoring .............................................................................................................................. 30

4.1.3 Synchronisation Sources ......................................................................................................... 39

4.1.4 CDR .......................................................................................................................................... 40

4.1.5 E1 Streams .............................................................................................................................. 45

4.1.6 Dial plan .................................................................................................................................. 52

4.1.7 Routing .................................................................................................................................... 58

4.1.8 Internal Resources .................................................................................................................. 79

4.1.9 Network Services .................................................................................................................... 92

4.1.10 User Configuration ............................................................................................................... 95

4.1.11 Security ................................................................................................................................ 95

4.1.12 Network Utilities .................................................................................................................. 99

4.1.13 RADIUS Configuration ........................................................................................................ 100

4.1.14 Tracing ............................................................................................................................... 107

4.1.15 Working with Objects and the Objects menu .................................................................... 111

4.1.16 Saving Configuration and the Service menu ...................................................................... 111

4.1.17 Time and Date Settings ...................................................................................................... 111

4.1.18 Firmware Upgrade via Web Interface ............................................................................... 111

4.1.19 Licence Renewal ................................................................................................................ 112

4.1.20 Help Menu ......................................................................................................................... 112

4.1.21 Password Configuration for Web Configurator Access ..................................................... 113

4.1.22 View Factory Settings and System Information ................................................................. 113

4.1.23 Configurator Exit ................................................................................................................ 114

4.2 Command Line, List of Supported Commands and Keys ................................................................ 114

4.2.1 System of Commands for SMG Gateway Operation in the Debug Mode ............................ 114

4.2.2 Tracing Commands Available Through the Debug Port ........................................................ 116

4.3 SMG Configuration via Telnet, SSH, or RS-232 ............................................................................... 116

6 SMG digital gateway

4.3.1 List of CLI Commands ............................................................................................................ 117

4.3.2 Changing Device Access Password via CLI ............................................................................. 119

4.3.3 Statistics Mode ...................................................................................................................... 120

4.3.4 Management Mode .............................................................................................................. 123

4.3.5 General Device Configuration Mode..................................................................................... 125

4.3.6 СDR Configuration Mode ...................................................................................................... 128

4.3.7 Access Categories Configuration Mode ................................................................................ 130

4.3.8 E1 Stream Configuration Mode ............................................................................................. 130

4.3.9 Fail2ban Configuration Mode ............................................................................................... 134

4.3.10 Firewall Configuration Mode ............................................................................................. 135

4.3.11 SS7 Line Group Configuration Mode .................................................................................. 139

4.3.12 Modifier Table Configuration Mode .................................................................................. 141

4.3.13 Network Parameter Configuration Mode .......................................................................... 144

4.3.14 Numbering Schedule Configuration Mode ........................................................................ 149

4.3.15 Q.931 Timer Configuration Mode ...................................................................................... 153

4.3.16 RADIUS Configuration Mode .............................................................................................. 154

4.3.17 Static Route Configuration Mode ...................................................................................... 159

4.3.18 SIP/SIP-T General Configuration Mode .............................................................................. 159

4.3.19 SIP/SIP-T Interface Configuration Mode ............................................................................ 160

4.3.20 SS-7 Category Modification Configuration Mode .............................................................. 166

4.3.21 SS-7 Timer Configuration Mode ......................................................................................... 166

4.3.22 Sync Configuration Mode ................................................................................................... 168

4.3.23 Syslog Configuration Mode ................................................................................................ 168

4.3.24 Trunk Group and Trunk Direction Configuration Mode ..................................................... 170

5 APPENDIX A. CABLE CONTACT PIN ASSIGNMENT .................................................................................. 173

6 APPENDIX B. ALTERNATIVE METHOD OF DEVICE FIRMWARE UPDATE ................................................. 174

7 APPENDIX C. EXAMPLES OF MODIFIER OPERATION AND DEVICE CONFIGURATION VIA CLI ................. 177

8 APPENDIX D. CORRELATION BETWEEN ROUTING, SUBSCRIBERS, AND SIGNAL LINK PARAMETERS ..... 187

9 APPENDIX E. GUIDELINES FOR SMG OPERATION IN A PUBLIC NETWORK ............................................. 188

10 APPENDIX F. DEVICE INTERACTION WITH MONITORING SYSTEMS ....................................................... 189

11 APPENDIX G: CONFIGURATION OF E1 CHANNELS TRANSIT THROUGH A SEMIPERMANENT

CONNECTION ............................................................................................................................................... 192

12 TECHNICAL SUPPORT .............................................................................................................................. 197

13 ACCEPTANCE CERTIFICATE AND WARRANTY ......................................................................................... 198

SMG digital gateway 7

INTRODUCTION

Today, means of communication employing state-of-the-art hardware and software solutions evolve
rapidly. New communication devices, which utilise alternative data transmission principles, pose a problem of
their integration into existing communication networks. The solution is to use special equipment, which
interconnects diverse segments of networks. Currently, such equipment is represented by digital gateways. They
allow gradual transition from existing communication networks to more efficient ones with alternative operation
principles.

At present, IP networks are considered to be the most efficient when they are weakly dependent from
data type and transmission medium and at the same time are flexible and manageable. Designed and
manufactured by Eltex, SMG digital gateway is intended for interfacing of traditional communication networks
based on the link switching principle with communication networks used for IP network data transmission.

This operation manual details main features of SMG-2 and SMG-4 digital gateways. The document
contains technical specifications of the gateway and its components. Also, it provides an overview of operation
and maintenance software-based procedures.

8 SMG digital gateway

1 DEVICE DESCRIPTION

1.1 Purpose

The SMG trunk gateway is designed to interface signalling, PSTN (E1) media streams, and VoIP networks.

SMG is an optimal and robust solution that can be used to upgrade, develop, and migrate

telecommunication infrastructures from PSTN to NGN.

SMG Main Specifications

 Number of E1 interfaces:

– for SMG-2: 1 or 2

1

;

– for SMG-4: 4.

 Number of VoIP channels:

– for SMG-2: 104;
– for SMG-4: 128.

 Maximum load intensity—40 cps.
 Number of Ethernet ports:

– 1 port 10/100/1000BASE-T.

 Static address and DHCP support.
 IP telephony protocols: SIP, SIP-T, SIP-I.
 TDM protocols: ISDN PRI(Q.931), QSIG, and CORNET for subscriber name transmission, SS-7

(quasi-associated mode operation).

 DTMF transmission (SIP INFO, RFC2833, in-band).
 Echo cancellation (G.168 recommendation).
 Voice activity detector (VAD).
 Comfortable noise generator (CNG).
 Adaptive or fixed jitter buffer.
 V.152 data transmission.
 Fax transmission:

– G.711 pass through;
– T.38 UDP Real-Time Fax.

 NTP support.
 DNS support.
 SNMP support.
 ToS for RTP and signalling.
 Firmware update: via web interface, CLI (Telnet, SSH, console (RS-232));
 automatic update of firmware and device configuration.
 Configuration and setup (also remotely):

– web interface;
– CLI (Telnet, SSH, console (RS-232)).

1

Only one E1 stream is available in an SMG-2 device by default. To activate another one, a special licence is required. For

more information about licences, see section 4.1.19. Licence Renewal

SMG digital gateway 9

 Remote monitoring:

– web interface;
– SNMP.

SIP/SIP-T/SIP-I Functions

 RFC 2976 SIP INFO (for DTMF transmission);
 RFC 3204 MIME Media Types for ISUP and QSIG (ISUP support);
 RFC 3261 SIP;
 RFC 3262 Reliability of Provisional Responses in SIP (PRACK);
 RFC 3263 Locating SIP servers for DNS;
 RFC 3264 SDP Offer/Answer Model;
 RFC 3265 SIP Notify;
 RFC 3311 SIP Update;
 RFC 3323 Privacy Header;
 RFC 3325 P-Asserted-Identity;
 RFC 3372 SIP for Telephones (SIP-T);
 RFC 3398 ISUP/SIP Mapping;
 RFC 3515 SIP REFER;
 RFC 3581 Symmetric Response Routing;
 RFC 3665 Basic Call Flow Examples;
 RFC 3666 SIP to PSTN Call Flows;
 RFC 3891 SIP Replaces Header;
 RFC 3892 SIP Referred-By Mechanism;
 RFC 4028 SIP Session Timer;

 RFC 4566 Session Description Protocol (SDP);

 RFC 5806 SIP Diversion Header;
 SIP Enable/Disable 302 Responses;
 Q1912.5 SIP-I;
 SIP/SIP-T/SIP-I interaction;
 Delay offer;
 SIP OPTIONS Keep-Alive (SIP Busy Out).

1.2 Typical Applications

This manual describes several methods of SMG connection.

1.2.1 Interface for TDM and VoIP Network Signalling and Media Streams

In this configuration, the device allows connection of up to 4 E1 streams with various signalling (SS-7, ISDN
PRI/QSIG/CORNET) and service protocols for up to 128 uncompressed channels (G.711 codec), for up to
72 compressed channels (G.729 A / 20-80), or for 54 T.38 fax channels; maximum load intensity—40 cps.

The device connects to an IP network via 10/100/1000 BASE-T network interface using SIP/SIP-T/ SIP-I
protocols.

10 SMG digital gateway

Fig. 1.1—Interfacing of TDM and VoIP Network Signalling and Media Streams Using SMG-4

Fig. 1.2—Interfacing of TDM and VoIP Network Signalling and Media Streams Using SMG-2

Fig. 3 shows TDM and VoIP network interfacing and uses interaction between МС240 digital PBX and

ECSS-10 software switch as an example.

Fig. 1.3—Interfacing of TDM and VoIP Network Signalling and Media Streams

Fig. 4 shows scheme of semi-permanent connection over E1 channels through an Ethernet network.

Fig. 1.4 - Semi-permanent connection over E1 channels trough an Ethernet network

1.3 Device Design and Operating Principle

SMG has a submodule architecture and contains the following elements:

SMG digital gateway 11

 A controller featuring:
 a controlling CPU,
 flash memory of 64 MB,
 512 MB RAM;
 М4Е1 submodule of E1 streams;
 SM-VP-M200 IP submodule for SMG-2;
 SM-VP-M300 IP submodule for SMG-4;
 a phase-lock-loop (PLL) frequency control system.

See the SMG functional chart in Fig. 4.

Fig. 1.5—SMG Functional Chart

In the TDM-IP direction, a signal coming to E1 streams is transferred to VoIP submodule audio codecs (a
line of 128 TDM channels) via the intrasystem backbone to be encoded using one of the selected standards and
further transferred as digital packets to the central processing unit. In the IP-TDM direction, digital packets are
transferred to the VoIP submodule to be decoded and further transferred to E1 streams via the intrasystem
backbone.

External 2 Mbps E1 streams are transmitted to framers through matching transformers. At that,
synchronisation signal is extracted from the stream and fed to the common synchronisation line of the device.
Synchronisation line priority is managed at the software level according to the defined algorithm.

See Fig. 5 for device firmware architecture.

12 SMG digital gateway

Fig. 1.6—SMG firmware architecture

1.4 Main Specifications

The main specifications of the terminal are provided in the following tables:

Table 1.1 —Main Specifications

VoIP Protocols

Supported protocols

SIP-Т/SIP-I
SIP
T.38

Audio Codecs

Codecs

G.711 (A/U)
G.729 AB
G.723.1 (6.3 Kbps, 5.3 Kbps)
G.726 (32 Kbps)
CLEARMODE (RFC 4040)

Number of VoIP Channels Supported by a Submodule Depending on the Codec Type

Codec/packetisation time, ms

Number of channels

SMG-2/SMG-4 with SM-VP-M300
submodule

SMG-2 with SM-VP-M200
submodule

G.711 (A/U) / 20-60
G.711 (A/U) / 10
G.729 A / 20-80
G.729 A / 10
G.723.1 (6.3 Kbps, 5.3 Kbps)
G.726 / 20
G.726 / 10
Т.38

128
112
72
62
58
98
88
54

104
74
48
41
39
65
59
36

Electrical Ethernet Interface Specifications

No. of interfaces

1

Electric port

RJ-45

Data transfer rate, Mbps

Auto detection, 10/100/1000 Mbps,
duplex

SMG digital gateway 13

Supported standards

10/100/1000BaseT

Console Parameters

RS-232 serial port

Data transfer rate, bps

115200

Electric signal parameters

Acc. to ITU-T V.28 guidelines

E1 Interface Parameters

No. of interfaces
SMG-4

SMG-2

4

1 or 2

2

Electric port

RJ-48

No. of channels

Acc. to ITU-T G.703 and G.704 guidelines

Line data transfer rate

2,048 Mbps

Line code

HDB3, AMI

Output signal to the line

3.0 V peak for 120 Ω load

2.37 V peak for 75 Ω load
(acc. to CCITT G.703 guidelines)

Input signal from the line

from 0 to -6 dB in relation to the standard output
impulse

Elastic buffer

2 frame capacity

Signalling protocol

ISDN PRI (Q.931), QSIG and CorNet to transmit user
name, SS-7

General Parameters

Operating temperature range

from +5°C to 40°C

Relative humidity

up to 80%

Power voltage

12 V DC, 2 А power adapter

Power consumption

not more than 10 W

Dimensions (W x H x D)

187x124x32

Net weight

0.3 kg

Gross weight

0.5 kg

2

Only one E1 stream is available in an SMG-2 device by default. To activate another one, a special licence is required. For

more information about licences, see section 4.1.19. Licence Renewal

14 SMG digital gateway

1.5 Design

SMG trunk gateway is enclosed in 187x124x32 mm plastic casing.

For external view of the device panels, see Fig. 6, 7a, and 7b.

Fig. 1.7—SMG External View. Top and Side Panels

Fig. 1.8—SMG-4 External View. Rear Panel

Fig. 1.9—SMG-2 External View. Rear Panel

For ports, LEDs, and controls located on the device, see Table 2.1.

SMG digital gateway 15

Table 2.1—Description of Ports, LEDs, and Controls Located on the Front Panel

№

Panel Element

Description

Top panel. Operation indicators

1

Power

Power indicator

2

LAN

Network activity indicator

3

USB

USB operation indicator

4

Alarm

Device critical failure indicator

5

Status

Device operation indicator

6

Sync

Synchronisation indicator

7

E1 0..3

E1 stream operation indicator; E1 2 and E1 3 LEDs are inactive
for SMG-2

Side panel. Function button

8 F Function button

Rear panel. Ports and controls

9

ON/OFF

On/off button

10

12V

Power socket (for connection to power line via the supplied
adapter)

11

LAN 10/100/1000

1 RJ-45 port for Ethernet 10/100/1000 Base-T interface

12

USB

USB port for external storage device

13

Console

RJ-45 console port for local device administration (for
connector wiring, see Appendix A)

14

E1 0..3 (for SMG-4)

4 x RJ-48 ports for Е1 streams (for connector wiring, see
Appendix A)

E1 0..1 (for SMG-2)

2 x RJ-48 ports for Е1 streams3 (for connector wiring, see
Appendix A)

1.6 LED Indication

The current status of the device is shown by the Power, LAN, USB, Alarm, Status, Sync, and E1 indicators
located on the top panel.

Indicator statuses are listed in Tables 3.1 and 3.2.

Table 3.1—LED Indication of the Device Status in Operation

LED

LED Status

Device Status

Power

Off

No power supply from 12 V adapter

Solid green

12 V power supplied to the device

LAN

Off

Link lost

Solid green / blinking green

Port is in the 10/100Base-TX mode

Solid yellow / blinking yellow

Port is in the 1000Base-T mode

USB

Off

USB device is not connected

Solid green

A high-speed USB device is connected

Solid red

A low-speed USB device is connected

Alarm

Blinking red

Critical device failure

3

Only one E1 stream is available in an SMG-2 device by default. To activate another one, a special licence is required. For

more information about licences, see section 4.1.19. Licence Renewal

16 SMG digital gateway

Solid red

Non-critical device failure

Solid yellow

Non-critical warnings, no failures

Solid green

Normal operation

Status

Solid green

Normal operation

Off

Device power lost

Sync

Off

Synchronisation sources not defined

Solid green

Synchronisation from source available

Solid red

Synchronisation from source unavailable

Table 3.2—LED Indication During Device Startup and Reset to Factory Defaults

No.

LED

Reset to Factory Defaults

(Device Is On)

Sync

Alarm

Status

1

Yellow

Yellow

Yellow

Press the F button and hold for 1 second until the following
pattern appears, then release the button. The device reboot
will start in 3 seconds.

2

Off

Off

Yellow

The device is powered on, the operating system is not loaded.

3

Off

Green

Green

The gateway operating system is being loaded. When the
pattern appears, press the F button and hold it for 40–
45 seconds to change network parameters and restore the
device configuration to factory defaults.

4

Off

Yellow

Yellow

When the pattern appears, release the F button.
After a while, the following message will be displayed in the
console.
<<<BOOTING IN SAFE-MODE.RESTORING DEFAULT
PARAMETERS>>>
Reset to factory defaults is complete.

The device can also be reset to factory defaults during startup.
Skip step 1 in this case.

Ethernet interface status is also shown by LED indicators built in the 1000/100 connector.

Table 3.3—LED Indication for Ethernet 1000/100 Interfaces

Device Status

LED/Status

Yellow LED 1000/100

Green LED 1000/100

The port is in the 1000Base-T mode, no data transfer

Solid on

Solid on
The port is in the 1000Base-T mode, data transfer

Solid on

Blinking

The port is in the 10/100Base-TX mode, no data transfer

Off

Solid on
The port is in the 10/100Base-TX mode, data transfer

Off

Blinking

Table 3.4 shows E1 streams indication.

SMG digital gateway 17

Table 3.4—Е1 Indication

Stream Status

E1 Indicator

Red

Yellow

Green

Е1 is disabled in the gateway configuration

Off

Off

Off

E1 stream failure

Blinking

(200 ms)

Off

Off

Loss of signal (LoS)

On

Off

Off

AIS failure

Blinking

(200 ms)

Blinking

(200 ms)

Off

LOF failure

Blinking

(200 ms)

Off

Off

LOMF failure

Blinking

(200 ms)

Off

Off

E1 stream normal operation

Off

Off

On

Failure on a remote host (RAI)

Off

On

Off

E1 stream is in operation, the stream has slips

Off

Blinking

(500 ms)

Blinking

(500 ms)

E1 stream is being tested

Blinking

(200 ms)

Off

Blinking

(200 ms)

Table 3.5 provides a detailed description of the failures shown by the Alarm indicator.

Indication of CDR Files Saving
When the FTP server is not available, CDRs will be saved to the device RAM. 30 MB are allocated
for storing CDR files. If the memory is full up to a specified value, a fault will be indicated.

Table 3.5—Alarm Indication

Alarm LED Status

Fault Level

Fault Description

Blinking red

Critical failure

Configuration error

Connection with SIP module lost

SS-7 line group fault (when the Fault indication checkbox is checked in the
Routing/SS line groups menu)

E1 stream fault (when the Alarm indication checkbox is checked in the Е1
streams/Physical parameters menu)

FTP server is unavailable, RAM utilisation for storing CDR files exceeds 50%
(15–30 MB)

CPU temperature exceeds 100 ºС

Less than 25 MB free RAM (5%)

Free storage on a connected USB drive is less than

- 5% of the total capacity (for drives with less than 5 GB storage),

- 256 MB (for drives with more than 5 GB storage)

Opposing SIP device does not respond to OPTIONS queries, when regular
checks by OPTIONS messages are enabled

setting up of semi-permanent connection over E1 channel failed

Solid red

Non-critical
failure (errors)

SS-7 link fault (when the Fault indication checkbox is checked in the
Routing/SS line groups menu)

18 SMG digital gateway

Synchronisation fault (free-run mode operation)

FTP server is unavailable, RAM utilisation for storing CDR files is less than 50%
(5–15 MB)

No connection to one of the SM-VP-300 modules

CPU temperature reached 90 ºС

Less than 50 MB free RAM (10%)

Free storage on a connected USB drive is less than

- 10% of the total capacity (for drives with less than 5 GB storage),

- 512 MB (for drives with more than 5 GB storage)

CPU load is about or above 95% during the last 9 seconds

Solid yellow

Warnings

E1 stream remote fault

E1 stream slipping

Synchronisation from a lower priority source (a higher priority one is not
available)

FTP server is unavailable, RAM utilisation for storing CDR files is below 5 MB

CPU temperature reached 85 ºС

Less than 128 MB
free RAM (25%)

CPU load is about or above 90% during the last 9 seconds

Free storage on a connected USB drive is less than

- 15% of the total capacity (for drives with less than 5 GB storage),

- 1,024 MB (for drives with more than 5 GB storage)

1.7 The F Function Button

The F button allows device reboot, restoration to factory configuration, and recovery of forgotten

password.

For instructions on reset of an operating device to factory defaults, see Table 3.2.
When the factory configuration is restored, the device can be accessed by IP address 192.168.1.2 (mask

255.255.255.0):

– via telnet or console: login: admin, password: rootpasswd;
– via web interface: login: admin, password: rootpasswd.

After that, saving the factory configuration, restoring a password, or rebooting the device can be

performed.

Saving Factory Configuration

To save the factory configuration: connect via telnet or console using admin for login and rootpasswd for
password; enter the sh command (the device will switch from the CLI mode to the SHELL mode), enter the save
command, and restart using the reboot command. The gateway will be restarted with the factory configuration.

********************************************

* Welcome to SMG-4 *

********************************************

smg login: admin

Password: rootpasswd

********************************************

* Welcome to SMG-4 *

********************************************

Welcome! It is Thu Aug 21 11:40:40 GMT+6 2014

SMG4> sh

SMG digital gateway 19

/home/admin # save
tar: removing leading '/' from member names
*Saved successful
New image 1
Restored successful
/home/admin # reboot

Password Recovery

To recover a password: connect via telnet, SSH, or console, enter the sh command (the device will switch
from the CLI mode to the SHELL mode), enter the restore command (the current configuration will be restored),
enter the passwd command (the device will request to enter and confirm a new password), enter the save
command, and restart using the reboot command. The gateway will be restarted with the current configuration
and the new password.

If the device is rebooted without any additional operations, the current configuration will be restored on
the device without password recovery. The gateway will be restarted with the current configuration and the old
password.

********************************************

* Welcome to SMG-4 *

********************************************

smg login: admin

Password: rootpasswd

********************************************

* Welcome to SMG-4 *

********************************************

Welcome! It is Thu Aug 21 11:40:40 GMT+6 2014

SMG4> sh

/home/admin # restore

Welcome! It is Fri Jul 2 12:57:56 UTC 2010

SMG4> sh

/home/admin # restore

New image 1

Restored successful

/home/admin # passwd admin

Changing password for admin

New password: 1q2w3e4r5t6y

Retype password: 1q2w3e4r5t6y

passwd: password for admin is changed

/home/admin # save

tar: removing leading '/' from member names

*Saved successful

New image 1

Restored successful

/home/admin # reboot

1.8 Delivery Package

SMG standard delivery package includes:

 SMG-2 or SMG-4 trunk gateway,
 power adapter,
 operation manual and documentation package.

20 SMG digital gateway

1.9 Safety Instructions

1.9.1 General Guidelines

Any operations with the equipment should comply to the Safety Rules for Operation of Customers'

Electrical Installations.

Operations with the equipment should be carried out only by personnel authorised in accordance
with the safety requirements.

 Before operating the device, all engineers should undergo special training.
 The device should only be connected to properly functioning supplementary equipment.
 The SMG trunk gateway can be used 24/7 provided the following requirements are met:

– Ambient temperature from 0 to +40°C.
– Relative humidity up to 80% at +25°C.
– Atmosphere pressure from 6.0 х 10

4

to 10.7х104 Pa (from 450 to 800 mm Hg).

 The device should not be exposed to mechanical shock, vibration, smoke, dust, water, and

chemicals.

 To avoid components overheating, which may result in device malfunction, do not block air vents

or place objects on the equipment.

1.9.2 Electrical Safety Requirements

 Prior to turning the device on, check that all cables are undamaged and securely connected.
 Before dismantling and assembling the device, make sure the power supply is disabled.

SMG digital gateway 21

2 SMG INSTALLATION

Check the device for visible mechanical damage before installing and turning it on. In case of any damage,
stop the installation, fill in the corresponding document, and contact your supplier.

If the device has been exposed to low temperatures for a long time before installation, leave it for 2 hours
at ambient temperature prior to operation. If the device has been exposed to high humidity for a long time,
leave it for at least 12 hours in normal conditions prior to turning it on.

2.1 Startup Procedure

1. Connect stream (E1) and Ethernet cables to corresponding gateway connectors.

2. Connect the power adaptor to the device.

3. Turn the device on and check the front panel LEDs to make sure the terminal is in normal

operating conditions.

2.2 Opening the Casing

Prior to proceed, disable SMG power supply and disconnect all cables.

Fig. 2.1—Opening the Casing

1. Use a screwdriver to remove 4 screws holding the bottom panel of the device as shown in the

figure.

2. Pull the top panel (cover) of the device to remove it.

To assemble the device, repeat all the steps above in the reverse order.

22 SMG digital gateway

2.3 RTC Battery Replacement

RTC (an electric circuit designed for independent chronometric data metering—current time, date, day of

the week, etc.) installed on the device plate has a battery with the following specifications:

Battery type

Lithium

Form-factor

CR2032 (CR2024 option is possible)

Voltage

3 V

Capacity

225 mA

Diameter

20 mm

Thickness

3.2 mm

Battery life / expiration date

5 years

Storage conditions

-20 to +35 °С

Fig. 2.2—Battery Location in RTC

If battery life is expired, replace the battery with a new one to ensure correct and continuous operation of

the equipment. The replacement procedure is as follows:

1. Check if the device is energised.

2. If the voltage is present, disconnect the power supply.

3. Open the device casing (see section 2.2 Opening the Casing).

4. Remove the exhausted battery from the reverse side of the plate (Fig. 17) and install a new one in

the same position.

To assemble the device, repeat all the steps above in the reverse order.

If NTP synchronisation is disabled, the system date and time will require adjustment after
RTC battery replacement.

Used batteries should be recycled according to requirements.

SMG digital gateway 23

3 GENERAL GUIDELINES FOR GATEWAY OPERATION

The easiest way to configure and monitor the device is to use the web interface, so it is highly
recommended.

To prevent unauthorised access to the device, it is recommended to change the password for telnet and
console access (default username: admin, password: rootpasswd) and the administrator password for the web
interface. For information on password configuration for telnet and console access, see section 4.3.2 Changing
Device Access Password via CLI. For information on password configuration for web interface access, see
section 4.1.21. It is recommended to write down and store the configured passwords in a safe place, inaccessible
for intruders.

In order to prevent the loss of device configuration data, e. g. after reset to factory defaults, it is
recommended to make configuration backups and save them on a PC each time significant changes are made.

24 SMG digital gateway

4 DEVICE CONFIGURATION

The device provides 4 connection options: web interface, the Telnet protocol, SSH, or RS-232 cable

connection (for access via RS-232, SSH, or Telnet, use CLI).

All settings will take effect without gateway restart. To save configuration changes into the non­volatile memory, use the Service/Save Configuration into Flash menu in the web configurator or
the COPY RUNNING_TO_STARTUP command in CLI.

4.1 SMG Configuration via web Interface

To configure the device, establish a connection to the device in a web browser (hypertext document

viewer), e. g. Firefox, Google Chrome. Enter the device IP address in the address bar of the web browser.

SMG factory default IP address: 192.168.1.2, network mask: 255.255.255.0.

As soon as the IP address is entered, the device will request username and password.

Initial startup username: admin, password: rootpasswd.

Upon access to the web configurator, the System Information menu opens.

SMG digital gateway 25

The figure below illustrates navigation in the web configurator.

A window in user interface is divided into several areas.

Navigation tree

– enables management of the settings field. The navigation tree represents a
hierarchy of management sections and nested menus.

Settings field

– is defined by user selections. Allows user to view device settings and enter
configuration data.

Control panel

– a panel to control the settings field and firmware status.

Control menu

– drop-down menus in the control panel for the settings field and firmware status.

Alarms

– displays the current highest-priority fault and serves as a link to work with the fault
events log.

Authorisation

– a link to work with passwords, which are used to access the device via web

interface.

Control icons

– controls to work with objects in the settings field; duplicate the Objects menu of the

control panel:

– Add Object;

— Edit Object;

— Remove Object;

— View Object.

Control buttons

– controls to work with the settings field.

To prevent unauthorised access to the device during further work, it's recommended to change the
password (see section 4.1.21).

26 SMG digital gateway

The button (Hint) located next to the editing element provides an explanation for a

particular parameter.

4.1.1 System Parameters

System Settings

 Device name (for web pages only)—the device name used in the heading of the web configurator.
 Active dial plan count —the quantity of simultaneously active numbering schedules; up to

16 independent numbering schedules can be configured with a possibility to add subscribers and
create a customised call routing table.

Alarm Indication

 CPU load —when checked, the control system will be alerted about high CPU utilisation.
 RAM usage—when checked, the control system will be alerted when running out of free RAM.
 Local disk drive free space—when checked, the control system will be alerted when running out of

free memory on an external drive.

Auto configuration (Automatic Configuration)

 Active auto-update—enables automatic updates of firmware and configuration.
 Source—a method to receive parameters for automatic updates:

– Static—use automatic update parameters set in the configuration;
– DHCP—select a network interface with the configured DHCP protocol, which will be used

to retrieve Options 66 and 67 for automatic updates.

SMG digital gateway 27

 Protocol—a protocol, which will be used for automatic updates (TFTP/FTP/HTTP/HTTPS).
 Authentication—setting the flag enables authentication during automatic updates via the selected

protocol (FTP/HTTP/HTTPS).

 Name—a login to access the automatic update server.
 Password—a password to access the automatic update server.
 Server—IP address or network name of the automatic update server when the static source is

selected; update.local name is used by default.

 Update configuration—specifies to use automatic configuration updates.
 Configuration file name—name and path to the configuration file located on the automatic update

server; MAC.cfg by default, where MAC is the MAC address of the device in the xx.xx.xx.xx.xx.xx
format.

 Configuration upgrade period, min—time interval in minutes between requests for a configuration

file sent to the automatic update server.

 Software update—enables automatic firmware updates.
 Software version file name—name of the manifest file on the automatic update server that

contains a description of the firmware version, a path to the firmware file, and time of firmware
update.

 Software upgrade period, min—time interval in minutes between requests for a manifest file on

the automatic update server.

4.1.1.1 Format of Options 66 and 67

Option 66 is required to retrieve the IP address or domain name of the automatic update server.

Syntax:

“<IP address or domain name of the update server>“

Example:

“update.local“

or

“192.168.1.3“

Option 67 is required to retrieve the path to the file with firmware version description (the manifest file)
and the path to the configuration file.

Syntax:

“<Path to smg4.manifest (or smg2.manifest) file>;<Path and name of the configuration file>“

Example:

“/smg4/firmware/smg4.manifest;/smg4/conf/<MAC>.cfg“

“/smg2/firmware/smg2.manifest;/smg2/conf/<MAC>.cfg”

If a device receives a configuration file name in the format "<MAC>.cfg" from the server, it automatically
replaces <MAC> with its own MAC address in the format 11.22.33.44.55.66 when addressing the server. This
means that the server should contain a configuration file named 11.22.33.44.55.66.cfg.

28 SMG digital gateway

Instead of using the expression "<MAC>.cfg", the server may send the configuration file name in the

following format: 11.22.33.44.55.66.cfg, where 11:22:33:44:55:66 is the factory MAC address of the device.

If no Options 66 and 67 are received from the DHCP server, their default values will be used.

For Option 66: "update.local".

For Option 67: "smg4.manifest;<MAC>.cfg";

"smg2.manifest;<MAC>.cfg".

4.1.1.2 smg4.manifest (smg2.manifest) File Format

smg4.manifest (smg2.manifest) is a text file containing information about the version and the path to the
firmware file located on the automatic update server, as well as the time to restart the device after firmware
update to a new version.

General format of the file content:

<firmware version>;<path to firmware file>; <time (in hours)>

The <firmware version> and <path to firmware file> parameters are mandatory. The <Time> parameter is
optional. If it is not specified, the device will restart as soon as there are no conversation sessions.

Example of a file with time set:

3.1.1.1076;smg4/smg4_firmware_3.1.1.1076.bin;18-21

Example of a file without time set:

3.1.1.1076;smg4/smg4_firmware_3.1.1.1076.bin

4.1.1.3 Algorithm of Automatic Configuration Loading and Checking for a New Configuration File

This procedure is used for automatic download of a new device configuration file from the server. The
configuration file contains the date and time of its creation:

SMG-config:
Version: 13
LastUpdate:
ID: 1
Date: 2015-03-30
Time: 05:59:28

While loading, SMG checks for a configuration file in the specified location on the FTP/TFTP/HTTP/HTTPS
sever (and authorises on the server if necessary). If it finds the configuration file, the gateway downloads it and
compares the creation date and time of the current file and the downloaded one's. If the downloaded file is
created later, the device saves and applies the new configuration. Otherwise, the current configuration remains
valid.

Thus, to change the gateway configuration, operator simply needs to upload a new configuration file to
the server with necessary adjustments and new date and time of creation. The configuration will be updated
automatically after the time set in the Configuration update period parameter.

SMG digital gateway 29

4.1.1.4 Algorithm of Automatic Software Updating and Checking for New Firmware Versions

During SMG loading or after the time set in Firmware update period elapses, the gateway checks for a
version description file (smg4.manifest/smg2.manifest) in the specified location on the server. If the file is found,
SMG downloads it. The file contains information on firmware file versions available on the server, their locations
and names, as well as (optional) the time period before device restart after update. If firmware versions on the
server differ from the current ones on the gateway, the device checks for active conversation sessions. If there
are none, the gateway downloads the firmware image specified in the smg4.manifest/smg2.manifest file and
updates the firmware. After the firmware update, the gateway checks for active voice sessions and restarts if
finds none. Otherwise, a 30 seconds timer starts. When the time runs out, the gateway checks for active
conversation sessions again. If the manifest file specifies a time period for restart, a timer starts for this period.
For example, if the file specifies 18–21, the device waits till 18:00 to check for active voice sessions. If it finds
none, the gateway restarts; otherwise, the 30 seconds timer starts. When the time runs out, the gateway checks
for active conversation sessions again.

30 SMG digital gateway

4.1.2 Monitoring

4.1.2.1 Telemetrics

This section contains information on the temperature sensors and CPU utilisation.

Temperature sensors

 TempSensor #0—CPU temperature.
 TempSensor #1—switch temperature.

Current CPU Utilisation

 USR—percentage of CPU time utilisation by user applications.
 SYS—percentage of CPU time utilisation by core processes.
 NIC—percentage of CPU time utilisation by applications with a modified priority.
 IDLE—percentage of unused CPU resources.
 IO—percentage of CPU time spent on I/O operations.
 IRQ—percentage of CPU time spent on processing of hardware interruptions.
 SIRQ—percentage of CPU time spent on processing of software interruptions.