3com VCX V7122 User manual

3Com

®

VCX

™

V7122 VoIP SIP

Gateway User Manual

Version 4.4

http://www.3com.com

Part Number 900-0255-01

Published June 2005

3Com VCX V7122 SIP VoIP Gateway User Manual

2

3Com Corporation, 350 Campus Drive, Marlborough MA 01752-3064

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3Com VCX V7122 SIP VoIP Gateway User Manual

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CONTENTS

ABOUT THIS GUIDE 9

How to Use This Guide 9

Conventions 10

Related Documentation 10

Documentation Comments 10

CHAPTER 1: VCX V7122 SIP OVERVIEW 13

Available Configurations 14

SIP Overview 15

VCX V7122 VoIP SIP Supported Features 15

General Features 15

Hardware Features 15

PSTN-to-SIP Interworking 16

Supported SIP Features 17

CHAPTER 2: VCX V7122 SIP PHYSICAL DESCRIPTION 19

General 19

The VCX V7122 Chassis 20

Power Supply 20

The TP-1610 Board 20

Board Hot-Swap Support 21

TP-1610 Front Panel LED Indicators 22

Rear Transition Module 23

Optional CPU Board 24

CHAPTER 3: INSTALLING THE VCX V7122 25

Unpacking 25

Package Contents 26

Mounting the VCX V7122 26

Mounting the VCX V7122 on a Desktop 26

Installing the VCX V7122 in a 19-inch Rack 26

Cabling the VCX V7122 28

Connecting the E1/T1 Trunk Interfaces 30

Installing the Ethernet Connection 31

Connecting the Power Supply 31

CHAPTER 4: GETTING STARTED 35

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Assigning the VCX V7122 IP Address 35

Assigning an IP Address Using HTTP 35

Assigning an IP Address Using BootP 36

Restoring Networking Parameters to Their Initial State 37

Configuring the VCX V7122 Basic Parameters 37

CHAPTER 5: WEB MANAGEMENT 41

Configuration Concepts 41

Overview of the Embedded Web Server 41

Computer Requirements 41

Password Control 42

Embedded Web Server Username and Password 42

Configuring the Web Interface via the ini File 42

Limiting the Embedded Web Server to Read-Only Mode 42

Disabling the Embedded Web Server 42

Accessing the Embedded Web Server 42

Using Internet Explorer to Access the Embedded Web Server 43

Getting Acquainted with the Web Interface 43

Main Menu Bar 44

Saving Changes 45

Entering Phone Numbers in Various Tables 45

Protocol Management 45

Protocol Definition Parameters 46

Advanced Parameters 47

Number Manipulation Tables 47

Configuring the Routing Tables 52

Configuring the Profile Definitions 58

Configuring the Trunk Group Table 62

Configuring the Trunk Group Settings 63

Advanced Configuration 65

Configuring the Network Settings 65

Configuring the Channel Settings 68

Configuring the Trunk Settings 69

Configuring the TDM Bus Settings 72

Restoring and Backing Up the Gateway Configuration 72

Regional Settings 73

Changing the VCX V7122 Username and Password 75

Status and Diagnostic 75

Gateway Statistics 75

Monitoring the VCX V7122 Trunks and Channels 77

Activating the Internal Syslog Viewer 79

System Information 80

Software Update Menu 81

Software Upgrade Wizard 81

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Auxiliary Files 86

Updating the Software Upgrade Key 88

Save Configuration 88

Resetting the VCX V7122 89

CHAPTER 6: INI FILE CONFIGURATION OF THE VCX V7122 91

Secured ini File 91

Modifying an ini File 91

The ini File Content 92

The ini File Structure 92

The ini File Structure Rules 92

The ini File Example 93

Basic, Logging, Web, and RADIUS Parameters 93

SNMP Parameters 101

SIP Configuration Parameters 102

ISDN and CAS Interworking-Related Parameters 114

Number Manipulation and Routing Parameters 119

E1/T1 Configuration Parameters 127

Channel Parameters 132

Dynamic Jitter Buffer Operation 136

Configuration Files Parameters 137

CHAPTER 7: CONFIGURATION FILES 139

Configuring the Call Progress Tones 139

Format of the Call Progress Tones Section in the ini File 139

Prerecorded Tones (PRT) File 141

PRT File Format 141

Voice Prompts File 142

CAS Protocol Configuration Files 142

CHAPTER 8: GATEWAY CAPABILITIES DESCRIPTION 143

Proxy or Registrar Registration Example 143

Redirect Number and Calling Name (Display) 143

ISDN Overlap Dialing 144

Using ISDN NFAS 144

NFAS Interface ID 145

Working with DMS-100 Switches 146

Configuring the DTMF Transport Types 146

Configuring the Gateway’s Alternative Routing (based on Connectivity and QoS) 150

Alternative Routing Mechanism 150

Determining the Availability of Destination IP Addresses 150

PSTN Fallback as a Special Case of Alternative Routing 150

Relevant Parameters 151

Working with Supplementary Services 151

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Call Hold and Retrieve Features 151

Call Transfer 151

TDM Tunneling 152

Implementation 152

Call Detail Report 154

Trunk to Trunk Routing Example 156

SIP Call Flow Example 157

SIP Authentication Example 160

CHAPTER 9: DIAGNOSTICS 163

VCX V7122 Self-Testing 163

Syslog Support 163

Syslog Servers 164

Operation 164

CHAPTER 10: BOOTP/DHCP SUPPORT 167

Startup Process 167

DHCP Support 169

BootP Support 169

Upgrading the VCX V7122 169

Vendor Specific Information Field 170

CHAPTER 11: SNMP-BASED MANAGEMENT 173

About SNMP 173

SNMP Message Standard 173

SNMP MIB Objects 174

SNMP Extensibility Feature 175

Carrier Grade Alarm System 175

Active Alarm Table 175

Alarm History 176

Cold Start Trap 176

Third-Party Performance Monitoring Measurements 176

Supported MIBs 177

SNMP Interface Details 180

SNMP Community Names 180

Trusted Managers 181

SNMP Ports 183

Multiple SNMP Trap Destinations 183

SNMP Manager Backward Compatibility 185

Element Management System 185

CHAPTER 12: SELECTED TECHNICAL SPECIFICATIONS 187

APPENDIX A: VCX V7122 SIP SOFTWARE KIT 191

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APPENDIX B: THE BOOTP/TFTP CONFIGURATION UTILITY 193

When to Use the BootP/TFTP 193

An Overview of BootP 193

Key Features 193

Specifications 194

Installation 194

Loading the cmp File, Booting the Device 194

BootP/TFTP Application User Interface 195

Function Buttons on the Main Screen 195

Log Window 196

Setting the Preferences 197

BootP Preferences 198

TFTP Preferences 198

Configuring the BootP Clients 199

Adding Clients 199

Deleting Clients 200

Editing Client Parameters 200

Testing the Client 201

Setting Client Parameters 201

Using Command Line Switches 202

Managing Client Templates 203

APPENDIX C: RTP/RTCP PAYLOAD TYPES AND PORT ALLOCATION 205

Payload Types Defined in RFC 1890 205

Defined Payload Types 205

Default RTP/RTCP/T.38 Port Allocation 206

APPENDIX D: FAX AND MODEM TRANSPORT MODES 209

Configuring Fax Relay Mode 209

Configuring Fax/Modem ByPass Mode 209

Supporting V.34 Faxes 210

APPENDIX E: VCX V7122 CLOCK SETTINGS 211

APPENDIX F: CUSTOMIZING THE VCX V7122 WEB INTERFACE 213

Replacing the Main Corporate Logo 213

Replacing the Main Corporate Logo with an Image File 214

Replacing the Main Corporate Logo with a Text String 215

Replacing the Background Image File 215

Customizing the Product Name 216

Modifying ini File Parameters via the Web AdminPage 217

APPENDIX G: ACCESSORY PROGRAMS AND TOOLS 219

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TrunkPack Downloadable Conversion Utility 219

Converting a CPT ini File to a Binary dat File 220

Creating a Loadable Voice Prompts File 221

Encoding/Decoding an ini File 223

Creating a Loadable Prerecorded Tones File 224

PSTN Trace Utility 226

Operation 226

APPENDIX H: SOFTWARE UPGRADE KEY 229

Loading the Software Upgrade Key 229

Loading the Software Upgrade Key Using the Embedded Web Server 229

Loading the Software Upgrade Key Using BootP/TFTP 231

Verifying That the Key was Successfully Loaded 231

Troubleshooting an Unsuccessful Loading of a Key 231

APPENDIX I: RELEASE REASON MAPPING 233

APPENDIX J: RADIUS BILLING AND CALLING CARD APPLICATION 237

Benefits 237

Features 237

Supported Architecture 238

Implementation 239

Basic Calling Card IVR Scenario 239

Call Flow Description 240

Operation and Configuration 241

Configuration Parameters 242

Supported RADIUS Attributes 243

RADIUS Server Messages 246

Authentication 246

Authorization 247

Accounting 247

Voice XML Interpreter 247

Features 248

Supported Elements and Attributes 249

Provided Calling Card System 255

Voice Prompts 255

VXML Flow Chart 257

VXML Script Example 261

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ABOUT THIS GUIDE

This User Manual describes the 3Com

®

VCX

™

V7122 Gateway.

This product is supported by software version 4.4, and enables you to send voice, fax, and

data over the same IP network.

Information contained in this document is believed to be accurate and reliable at the time of

printing. However, because of on-going product improvements and revisions, 3Com cannot

guarantee the accuracy of printed material after the Date Published nor can it accept

responsibility for errors or omissions. Updates to this document and other documents can be

viewed by registered Technical Support customers. See Appendix K: Obtaining Support for

Your 3Com Products for details on how to register your product and get support from 3Com.

How to Use This Guide

This book covers these topics:

Chapter 1: VCX V7122 SIP Overview

Chapter 2: VCX V7122 SIP Physical Description

Chapter 3: Installing the VCX V7122

Chapter 4: Getting Started

Chapter 5: Web Management

Chapter 6: ini File Configuration of the VCX V7122

Chapter 7: Configuration Files

Chapter 8: Gateway Capabilities Description

Chapter 9: Diagnostics

Chapter 10: BootP/DHCP Support

Chapter 11: SNMP-Based Management

Chapter 12: Selected Technical Specifications

Appendix A: VCX V7122 SIP Software Kit

Appendix B: The BootP/TFTP Configuration Utility

Appendix C: RTP/RTCP Payload Types and Port Allocation

Appendix D: Fax and Modem Transport Modes

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Appendix E: VCX V7122 Clock Settings

Appendix F: Customizing the VCX V7122 Web Interface

Appendix G: Accessory Programs and Tools

Appendix H: Software Upgrade Key

Appendix I: Release Reason Mapping

Appendix J: RADIUS Billing and Calling Card Application

Appendix K: Obtaining Support for Your 3Com Products

Conventions

Table 1 lists conventions that are used throughout this guide.

Table 1 Notice Icons

Icon Notice Type Description

Information note Information that describes important features or instructions.

Caution

Information that alerts you to potential loss of data or potential

damage to an application, device, system, or network.

Warning Information that alerts you to potential personal injury or death.

Related Documentation

The following documents are available on the 3Com Partner Access website for the 3Com

VCX V7111 Gateway:

 3Com VCX V7122 SIP VoIP Gateway Release Notes

 3Com VCX V7122 SIP VoIP Gateway Installation Guide

Where “network” appears in this manual, it means LAN, WAN, etc. accessed via

the gateway’s Ethernet interface.

Documentation Comments

Your suggestions are important to us because we want to make our documentation more

useful to you.

Please send e-mail comments about this guide or any of the VCX 7111 documentation and

Help systems to:

[email protected]

Please include the following information with your comments:

 Document title

 Document part number (usually found on the front page)

3Com VCX V7122 SIP VoIP Gateway User Manual

11

 Page number

 Your name and organization (optional)

Example:

3Com VCX V7112 VoIP SIP Gateway User Manual

Page 25

Part Number 900-0255-01

3Com VCX V7122 SIP VoIP Gateway User Manual

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3Com VCX V7122 SIP VoIP Gateway User Manual

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CHAPTER 1: VCX V7122 SIP OVERVIEW

The VCX V7122 SIP (Session Initialization Protocol) Voice over IP (VoIP) gateway enables

voice, fax, and data traffic to be sent over the same IP network. The VCX V7122 gateway

provides excellent voice quality and optimized packet voice streaming over IP networks.

The VCX V7122 uses the award-winning, field-proven DSP voice compression technology

used in other TrunkPack

TM

series products.

The VCX V7122 incorporates 1, 2, 4, 8 or 16 E1 or T1 spans for connection, directly to

Public Switched Telephone Network (PSTN) / Private Branch Exchange (PBX) telephony

trunks, and includes one or two 10/100 Base-TX Ethernet ports for connection to the

network.

The VCX V7122 supports up to 480 simultaneous VoIP or Fax over IP (FoIP) calls,

supporting various Integrated Services Digital Network (ISDN) Primary Rate Interface (PRI)

protocols such as EuroISDN, North American NI2, Lucent 5ESS, Nortel DMS100 and others.

In addition, it supports different variants of Channel Associated Signaling (CAS) protocols for

E1 and T1 spans, including MFC R2, E&M immediate start, E&M delay dial/start, loop start

and ground start.

The VCX V7122 gateway, best suited for large and medium-sized VoIP applications, is a

compact device, comprising a 19-inch 1U chassis with optional dual AC or single DC power

supplies.

The deployment architecture can include several VCX V7122 gateways in branch or

departmental offices, connected to local PBXs. Call routing is performed by the gateways

themselves or by SIP Proxy(s).

The VCX V7122 gateway enables users to make low cost long distance or international

telephone/fax calls between distributed company offices, using their existing telephones/fax.

These calls are routed over the existing network ensuring that voice traffic uses minimum

bandwidth.

The VCX V7122 can also route calls over the network using SIP signaling protocol, enabling

the deployment of "Voice over Packet" solutions in environments where access is enabled to

PSTN subscribers by using a trunking media gateway. This provides the ability to transmit

voice and telephony signals between a packet network and a TDM network. Routing of the

calls from the PSTN to a SIP service node (e.g., Call Center) is performed by the VCX

V7122 internal routing feature or by a SIP Proxy.

Figure 1

below illustrates typical VCX V7122 gateway applications over VoIP Network.

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Figure 1 Typical VCX V7122 Gateway Application

SIP

Service

Node

LAN

PSTN

LAN

Telephone

LAN

SIP Proxy

Mediant 2000

E1/T1 PRI/CAS

Router

Mediant 2000

PBX - Branch B

E1/T1 PRI/CAS

Mediant 2000

PBX - Branch A

E1/T1 PRI/CAS

LAN

IP Ne twor k

Router

Available Configurations

The VCX V7122 is provided in the following configurations.

E1 Available Configurations:

 30 Channels on 1 E1 span with gateway-1 only

 60 Channels on 2 E1 spans with gateway-1 only

 120 Channels on 4 E1 spans with gateway-1 only

 240 Channels on 8 E1 spans with gateway-1 only

 480 Channels on 16 E1 spans with gateway-1 and gateway-2

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T1 Available Configurations:

 24 Channels on 1 T1 span with gateway-1 only

 48 Channels on 2 T1 spans with gateway-1 only

 96 Channels on 4 T1 spans with gateway-1 only

 192 Channels on 8 T1 spans with gateway-1 only

 384 Channels on 16 T1 spans with gateway-1 and gateway-2

SIP Overview

SIP is an application-layer control (signaling) protocol used on the VCX V7122 for creating,

modifying, and terminating sessions with one or more participants. These sessions can

include Internet telephone calls, media announcements and conferences.

SIP invitations are used to create sessions and carry session descriptions that enable

participants to agree on a set of compatible media types. SIP uses elements called proxy

servers to help route requests to the user's current location, authenticate and authorize users

for services, implement provider call-routing policies and provide features to users.

SIP also provides a registration function that enables users to upload their current locations

for use by proxy servers. SIP, on the VCX V7122, complies with the IETF (Internet

Engineering Task Force) RFC 3261 (see http://www.ietf.org

).

VCX V7122 VoIP SIP Supported Features

This section provides a high-level overview of some of the many VCX V7122 supported

features.

General Features

 Superior, high quality PSTN gateway for Voice and Fax over IP calls.

 Up to 16 E1/T1/J1 digital spans supporting various PRI and CAS protocols.

 Compliant with SIP (RFC 3261).

 Coders include: G.711, G.723.1, G.726, G.729A and NetCoder at 6.4 to 8.8 kbps,

negotiable per channel.

 Echo Canceler with up to 128 msec tail length.

 Silence suppression with Comfort Noise Generation.

 Web management for easy configuration and installation.

 Simple Network Management Protocol (SNMP) and Syslog support.

 Simple Network Time Protocol (SNTP) support, the time-of-day can be obtained from a

standard SNTP server.

Hardware Features

 Two 10/100 Base-TX Ethernet interface connections to the network, providing network

redundancy.

 Compact, rugged 19-inch rack mount unit, one U high (1.75" or 44.5 mm), with two

compactPCI (cPCI) slots.

 Optional cPCI slot for third-party CPU board.

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 TP-1610/H.323 hot-swap cPCI board.

 Optional dual redundant AC or a single DC power supply.

PSTN-to-SIP Interworking

The VCX V7122 gateway performs interworking between ISDN and CAS via E1/T1/J1 digital

spans and SIP IETF signaling protocol. 16 E1, T1 or J1 spans are supported (480 channels)

in a two modules gateway.

The VCX V7122 gateway supports various ISDN PRI protocols such as EuroISDN, North

American NI2, Lucent 5ESS, Nortel DMS100, Meridian 1 DMS100, Japan J1, as well as

QSIG (basic call). PRI support includes User Termination or Network Termination side.

ISDN-PRI protocols can be defined on an E1/T1 basis (i.e., different variants of PRI are

allowed on different E1/T1 spans).

In addition, it supports numerous variants of CAS protocols for E1 and T1 spans, including

MFC R2, E&M wink start, E&M immediate start, E&M delay dial/start, loop-start, and ground

start. CAS protocols can be defined on an E1/T1 basis (i.e., different variants of CAS are

allowed on different E1/T1 spans).

PSTN to SIP and SIP to PSTN Called number can be optionally modified according to rules

that are defined in gateway ini file.

Supported Interworking Features

 Definition and use of Trunk Groups for routing IPPSTN calls.

 B-channel negotiation for PRI spans.

 ISDN Non Facility Associated Signaling (NFAS).

 Supports SIP2QSIG IETF draft-ietf-sipping-qsig2sip-04.txt, including interworking

between 180/183 responses with Session Description Protocol (SDP) and Q.931

Progress message.

 PRI to SIP Interworking of Q.931 Display (Calling name) information element.

 PRI (NI-2) to SIP interworking of Calling Name using Facility IE in Setup and Facility

messages.

 Configuration of Numbering Plan and Type for IPISDN calls.

 Interworking of PSTN to SIP release causes.

 Interworking of ISDN redirect number to SIP diversion header (according to IETF draft-

levy-sip-diversion-05.txt).

 Optional change of redirect number to called number for ISDN IP calls.

 Interworking of ISDN calling line Presentation & Screening indicators using RPID header

<draft-ietf-sip-privacy-04.txt>.

 Interworking of Q.931 Called and Calling Number Type and Number Plan values using

the RPID header.

 Supports ISDN en-block or overlap dialing for incoming TelIP calls.

 Supports routing of IPTel calls to predefined trunk groups.

 Supports a configurable channel select mode per trunk group.

 Supports various number manipulation rules for IPTel and Tel

IP, called and calling

numbers.

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 Option to configure ISDN Transfer Capability (per Gateway).

Supported SIP Features

The VCX V7122 SIP VoIP main features are:

 Reliable User Datagram Protocol (UDP) transport, with retransmissions.

 T.38 real time Fax (using SIP).

Note: If the remote side includes the fax maximum rate parameter in the SDP body of

the Invite message, the gateway returns the same rate in the response SDP.

 Works with Proxy or without Proxy, using an internal routing table.

 Fallback to internal routing table if Proxy is not responding.

 Supports up to four Proxy servers. If the primary Proxy fails, the VCX V7122

automatically switches to a redundant Proxy.

 Supports Proxy server discovery using Domain Name Server (DNS) SRV records.

 Proxy and Registrar Authentication (handling 401 and 407 responses) using Basic or

Digest methods.

 Supported methods: INVITE, CANCEL, BYE, ACK, REGISTER, OPTIONS, INFO,

REFER, UPDATE, NOTIFY, PRACK and SUBSCRIBE.

 Modifying connection parameters for an already established call (re-INVITE).

 Working with a Redirect server and handling 3xx responses.

 Early Media (supporting 183 Session Progress).

 PRACK reliable provisional responses <RFC 3262>.

 Call Hold and Transfer Supplementary services using REFER, Refer-To, Referred-By,

Replaces and NOTIFY messages.

 Supports RFC 3327 – Adding “Path” to Supported header.

 Supports RFC 3581 – Symmetric Response Routing.

 Session Timer <draft-ietf-sip-session-timer-10.txt>.

 RFC 2833 Relay for Dual Tone Multi Frequency (DTMF) digits, including payload type

negotiation.

 DTMF out-of-band transfer using:

 INFO method <draft-choudhuri-sip-info-digit-00.txt>

 INFO method, compatible with Cisco gateways

 NOTIFY method <draft-mahy-sipping-signaled-digits-01.txt>.DTMF out-of-band

transfer using INFO method (draft-choudhuri-sip-info-digit-00.txt)

 Can negotiate coder from a list of given coders.

 Supported coders:

 G.711 A-law 64 kbps (10, 20, 30, 40, 50, 60, 80, 100, 120 msec)

 G.711 µ-law 64 kbps (10, 20, 30, 40, 50, 60, 80, 100, 120 msec)

 G.723.1 5.3, 6.3 kbps (30, 60, 90, 120, 150 msec)

 G.726 32 kbps (10, 20, 30, 40, 50, 60, 80, 100, 120 msec)

 G.729A 8 kbps (10, 20, 30, 40, 50, 60, 80, 100, 120 msec)

G.729B is supported if Silence Suppression is enabled.

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 NetCoder 6.4, 7.2, 8.0 and 8.8 kbps (20, 40, 60, 80, 100, 120 msec).

 Transparent

For more updated information on the gateway’s supported features, see the latest VCX

V7122 & TP-1610 SIP Release Notes.

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CHAPTER 2: VCX V7122 SIP PHYSICAL

DESCRIPTION

This section provides detailed information on the VCX V7122 hardware components, the

location and functionality of the LEDs, buttons and connectors on the front and rear panels.

General

The VCX V7122 gateway comprises the following hardware components:

 A 19-inch 1U high rack mount chassis (see The VCX V7122 Chassis

on page 20).

 A single compactPCI™ TP-1610 board (see The TP-1610 Board

on page 20).

 A single TP-1610 Rear Transition Module (RTM) (see Rear Transition Module

on

page 23).

 A single available cPCI slot for an optional third-party CPU board (see Optional CPU

Board on page 24).

Figure 2

shows the front view of the VCX V7122 media gateway.

Figure 2 VCX V7122 Front View

Table 2 VCX V7122 Front View Component Descriptions

Item # Label Component Description

1 FAULT Dual AC Power LED.

2 cPCI board locking screws.

3 cPCI latches.

4 TP-1610 cPCI board, 16-trunk configuration.

1 7

2

3

6

5

4

8

6

9

10

11

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5 Status LED Indicators.

6 T1/E1 STATUS E1/T1 Trunk Status LED Indicators.

7 ETH Ethernet LED Indicators.

8 Reset button.

9 cPCI LED Indicators.

10 Power and Fan LEDs.

11 An available cPCI slot for an optional third-party CPU board.

The VCX V7122 Chassis

The VCX V7122 chassis is an industrial platform, 19” wide, 1U high and 12” deep that

houses the TP-1610 board in its front cage, slot #1 (the lower slot) and the TP-1610 RTM in

its rear cage, slot #1 (the lower slot).

Slot # 2 in the VCX V7122 chassis’ front and rear cages can optionally be used by customers

for a CPU board.

See Table 3

for detailed description of the chassis’ LED indicators.

Table 3 Chassis LED Indicators

Location Color Function

Right side of front panel

Green

The power is on.

Right side of front panel

Red

Fan failure - indicates that any of the internal fans has

significantly reduced its speed or has frozen.

Left side of front panel

Red

Power supply failure - indicates that one of the two AC

redundant power supplies is faulty or disconnected from the

AC/mains outlet. (This LED is only relevant for the dual AC

power supply).

Power Supply

The VCX V7122 power supply is available in three configuration options:

 Single universal 100-240 VAC 1 A max, 50-60 Hz.

 Dual-redundant 100-240 VAC 1.5 A max, 50-60 Hz.

 -48 VDC power supply suitable for field wiring applications.

The TP-1610 Board

The VCX V7122 is populated by a single compactPCI board, the TP-1610 (see Figure 3 on

page 21). The TP-1610 is a high-density, hot-swappable, cPCI resource board with a

capacity of up to 480 ports, supporting all necessary functions for voice, data and fax

streaming over IP networks. The TP-1610 is composed of one or two identical media

gateways modules: Gateway-1 and Gateway-2, each containing 240 DSP channels. These

media gateways are fully independent, each gateway having its own MAC (Media Access

Control) and IP addresses and LED indicators. The TP-1610 board is supplied with a rear I/O

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3com VCX V7122 User manual

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