3com VCX V7111 User manual

3Com

®

VCX

™

V7111 VoIP SIP

Gateway User Manual

Version 4.4

http://www.3com.com

Part Number 900-0261-01

Published June 2005

2 3Com VCX V7111 VoIP SIP Gateway User Manual

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

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If you are a United States government agency, then this documentation and the software described herein are provided to you

subject to the following:

All technical data and computer software are commercial in nature and developed solely at private expense. Software is

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Contents

3Com VCX V7111 VoIP SIP Gateway User Manual

3

CONTENTS

ABOUT THIS GUIDE 9

How to Use This Guide 9

Conventions 10

Related Documentation 10

Regulatory Information 11

Documentation Comments 11

CHAPTER 1: VCX V7111 SIP GATEWAY OVERVIEW 13

Gateway Description 13

SIP Overview 16

VCX V7111 Supported Features 17

General Features 17

Hardware Features 17

SIP Features 17

CHAPTER 2: VCX V7111 SIP GATEWAY PHYSICAL DESCRIPTION 21

VCX V7111 Front Panel 21

VCX V7111 Front Panel Buttons 22

VCX V7111 Front Panel LEDs 22

VCX V7111 Rear Panel 23

FXO and 2FXS, 4FXS, and 8FXS Rear Panel 23

24FXS Rear Panel 24

CHAPTER 3: INSTALLING THE VCX V7111 27

Unpacking 27

Package Contents 27

Mounting the VCX V7111 28

Mounting the VCX V7111 on a Desktop 28

Installing the FXO and 2FXS, 4FXS, and 8FXS in a 19-inch Rack 29

Installing the 24FXS in a 19-inch Rack 29

Mounting the FXO and 2FXS, 4FXS, and 8FXS on a Wall 30

Cabling the VCX V7111 31

Connecting the RS-232 Port to Your PC 35

Configuring the Serial Connection 35

Cabling the Lifeline Phone 35

4 3Com VCX V7111 VoIP SIP Gateway User Manual

CHAPTER 4: GETTING STARTED 39

Assigning the VCX V7111 IP Address 39

Assigning an IP Address Using HTTP 39

Assigning an IP Address Using BootP 40

Restoring Networking Parameters to Their Initial State 40

Configuring the VCX V7111 Basic Parameters 41

CHAPTER 5: CONFIGURING THE VCX V7111 43

Configuration Concepts 43

Overview of the Embedded Web Server 43

Computer Requirements 43

Password Control 44

Embedded Web Server Username and Password 44

Configuring the Web Interface via the ini File 44

Limiting the Embedded Web Server to Read-Only Mode 44

Disabling the Embedded Web Server 44

Accessing the Embedded Web Server 45

Using Internet Explorer to Access the Embedded Web Server 45

Getting Acquainted with the Web Interface 46

Main Menu Bar 46

Saving Changes 47

Entering Phone Numbers in Various Tables 47

Protocol Management 48

Protocol Definition Parameters 48

Configuring the Advanced Parameters 63

Configuring the Number Manipulation Tables 75

Configuring the Routing Tables 80

Configuring the Profile Definitions 89

Configuring the Endpoint Phone Numbers 95

Configuring the Hunt Group Settings 97

Configuring the Endpoint Settings 99

Configuring the FXO Parameters 105

Protocol Management ini File Parameters 108

Advanced Configuration 109

Configuring the Network Settings 109

Configuring the Channel Settings 119

Restoring and Backing Up the Gateway Configuration 128

Regional Settings 129

Changing the VCX V7111 Username and Password 131

Status and Diagnostics 131

Gateway Statistics 131

Monitoring the VCX V7111 Channels 134

Activating the Internal Syslog Viewer 135

3Com VCX V7111 VoIP SIP Gateway User Manual

5

System Information 136

Software Update 137

Software Upgrade Wizard 137

Auxiliary Files 143

Save Configuration 145

Resetting the VCX V7111 145

CHAPTER 6: INI FILE CONFIGURATION OF THE VCX V7111 147

Secured ini File 147

Modifying an ini File 147

The ini File Structure 148

The ini File Structure Rules 148

The ini File Example 148

CHAPTER 7: CONFIGURATION FILES 151

Configuring the Call Progress Tones and Distinctive Ringing File 151

Format of the Call Progress Tones Section in the ini File 151

Format of the Distinctive Ringing Section in the ini File 153

Prerecorded Tones (PRT) File 155

PRT File Format 155

The Coefficient Configuration File 156

CHAPTER 8: GATEWAYS CAPABILITIES DESCRIPTION 157

Proxy or Registrar Registration Example 157

Configuring the DTMF Transport Types 158

Configuring the Gateway’s Alternative Routing (Based on Connectivity and QoS) 161

Alternative Routing Mechanism 161

Determining the Availability of Destination IP Addresses 161

Relevant Parameters 161

Working with Supplementary Services 162

Call Hold and Retrieve 162

Consultation / Alternate 162

Call Transfer 163

Call Forward 163

Call Waiting 164

Message Waiting Indication 164

Call Termination on VCX V7111/FXO 165

Mapping PSTN Release Cause to SIP Response 166

Call Detail Report 166

Configuration Examples 168

Establishing a Call Between Two Gateways 168

SIP Call Flow 169

SIP Authentication Example 171

Remote IP Extension Between FXO and FXS 174

6 3Com VCX V7111 VoIP SIP Gateway User Manual

CHAPTER 9: DIAGNOSTICS 179

VCX V7111 Self-Testing 179

Rapid Self-Test Mode 179

Detailed Self-Test Mode 179

Troubleshooting the VCX V7111 via the RS-232 Port 180

Viewing the Gateway’s Information 180

Changing the Networking Parameters 180

Syslog Support 181

Syslog Servers 181

Operation 182

Solutions to Possible Problems 182

CHAPTER 10: BOOTP/DHCP SUPPORT 183

Startup Process 183

DHCP Support 185

BootP Support 186

Upgrading the VCX V7111 186

Vendor Specific Information Field 186

Reader's Notes 188

CHAPTER 11: SNMP-BASED MANAGEMENT 189

About SNMP 189

SNMP Message Standard 189

SNMP MIB Objects 190

SNMP Extensibility Feature 191

Carrier Grade Alarm System 191

Active Alarm Table 191

Alarm History 192

Cold Start Trap 192

Third-Party Performance Monitoring Measurements 192

Supported MIBs 193

SNMP Interface Details 195

SNMP Community Names 195

Trusted Managers 197

SNMP Ports 198

Multiple SNMP Trap Destinations 198

SNMP Manager Backward Compatibility 201

3Com’s Element Management System 201

CHAPTER 12: SELECTED TECHNICAL SPECIFICATIONS 203

APPENDIX A: VCX V7111 SIP SOFTWARE KIT 207

3Com VCX V7111 VoIP SIP Gateway User Manual

7

APPENDIX B: THE BOOTP/TFTP CONFIGURATION UTILITY 209

When to Use the BootP/TFTP 209

An Overview of BootP 209

Key Features 209

Specifications 210

Installation 210

Loading the cmp File, Booting the Device 210

BootP/TFTP Application User Interface 211

Function Buttons on the Main Screen 211

Log Window 212

Setting the Preferences 213

BootP Preferences 214

TFTP Preferences 214

Configuring the BootP Clients 215

Adding Clients 215

Deleting Clients 216

Editing Client Parameters 216

Testing the Client 217

Setting Client Parameters 217

Using Command Line Switches 218

Managing Client Templates 220

APPENDIX C: RTP/RTCP PAYLOAD TYPES AND PORT ALLOCATION 221

Packet Types Defined in RFC 1890 221

Defined Payload Types 221

Default RTP/RTCP/T.38 Port Allocation 222

APPENDIX D: FAX AND MODEM TRANSPORT MODES 225

Configuring Fax Relay Mode 225

Configuring Fax/Modem Bypass Mode 225

Supporting V.34 Faxes 226

Using Bypass Mechanism for V.34 Fax Transmission 226

Using Relay Mode for Both T.30 and V.34 Faxes 226

APPENDIX E: CUSTOMIZING THE VCX V7111 WEB INTERFACE 229

Replacing the Main Corporate Logo 229

Replacing the Main Corporate Logo with an Image File 230

Replacing the Main Corporate Logo with a Text String 231

Replacing the Background Image File 232

Customizing the Product Name 233

Modifying ini File Parameters via the Web Interface’s AdminPage 233

8 3Com VCX V7111 VoIP SIP Gateway User Manual

APPENDIX F: ACCESSORY PROGRAMS AND TOOLS 235

TrunkPack Downloadable Conversion Utility 235

Converting a CPT ini File to a Binary dat File 236

Encoding / Decoding an ini File 236

Creating a Loadable Prerecorded Tones File 238

Call Progress Tones Wizard 239

About the Call Progress Tones Wizard 239

Installation 240

Initial Settings 240

Recording Screen – Automatic Mode 240

Recording Screen – Manual Mode 243

The Call Progress Tones ini File 244

3Com VCX V7111 VoIP SIP Gateway User Manual

9

ABOUT THIS GUIDE

This user manual describes the following 3Com

®

VCX

™

V7111 Gateways:

 The 24-port VCX V7111 24FXS

 The eight-port VCX V7111 8FXS and 8FXO

 The four-port VCX V7111 4FXS and 4FXO

 The two-port VCX V7111 2FXS

These products, supported by software version 4.4, enable 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 Published Date nor can it accept

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

viewed by registered Technical Support customers.

How to Use This Guide

This book covers these topics:

 Chapter 1: VCX V7111 SIP Gateway Overview

 Chapter 2: VCX V7111 SIP Gateway Physical Description

 Chapter 3: Installing the VCX V7111

 Chapter 4: Getting Started

 Chapter 5: Configuring the VCX V7111

 Chapter 6: ini File Configuration of the VCX V7111

 Chapter 7: Configuration Files

 Chapter 8: Gateways Capabilities Description

 Chapter 9: Diagnostics

 Chapter 10: BootP/DHCP Support

 Chapter 11: SNMP-Based Management

 Chapter 12: Selected Technical Specifications

 Appendix A: VCX V7111 SIP Software Kit

 Appendix B: The BootP/TFTP Configuration Utility

 Appendix C: RTP/RTCP Payload Types and Port Allocation

 Appendix D: Fax & Modem Transport Modes

 Appendix E: Customizing the VCX V7111 Web Interface

 Appendix F: Accessory Programs and Tools

10 3Com VCX V7111 VoIP SIP Gateway User Manual

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 V7111 SIP Analog Gateways Release Notes

 3Com VCX V7111 Fast Track Installation Guide

When referring to VCX V7111 products, this document uses the following abbreviations:

Table 2 Documentation Abbreviations

Abbreviation Product Name

2FXS VCX V7111 2FXS

4FXS VCX V7111 4FXS

4FXO VCX V7111 4FXO

8FXS VCX V7111 8FXS

8FXO VCX V7111 8FXO

24FXS VCX V7111 24FXS

FXS Any FXS Gateway: 2FXS, 4FXS, 8FXS, or 24FXS

FXO Any FXO Gateway: the 4FXO or 8FXO

When referring to all these products generally, this document uses the term VCX V7111.

3Com VCX V7111 VoIP SIP Gateway User Manual

11

Regulatory Information

FXO stands for F

oreign Exchange Office, this interface replacing the analog

telephone and connecting to a PSTN line from the Central Office (CO) or to a PBX.

As such, the FXO is designed to receive line voltage and ringing current, supplied

from the CO or the PBX (just like an analog telephone). An FXO VoIP gateway

interfaces between the CO/PBX line and the Internet.

FXS stands for F

oreign Exchange Station, this interface replacing the Exchange

(i.e., the CO or the PBX) and connecting to analog telephones, dial-up modems,

and fax machines. As such, the FXS is designed to supply line voltage and ringing

current to these telephone devices. An FXS VoIP gateway interfaces between the

analog telephone devices and the Internet.

Caution: Ensure that you connect FXS ports to analog telephone or PBX-trunk

lines only, and FXO ports to CO/PBX lines only.

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:

[email protected]

Please include the following information with your comments:

 Document title

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

 Page number

 Your name and organization (optional)

Example:

3Com VCX V7111 VoIP SIP Gateways User Manual

Part Number 900-0261-01

Page 25

12 3Com VCX V7111 VoIP SIP Gateway User Manual

3Com VCX V7111 VoIP SIP Gateway User Manual

13

CHAPTER 1: VCX V7111 SIP GATEWAY

OVERVIEW

This document provides you with the information on installation, configuration, and operation

of the 24FXS 24-port, 8FXS and 8FXO 8-port, 4FXS and 4FXO 4-port, and 2FXS 2-port

VoIP media gateways. As these units have similar functionality, except for the number of

channels and some minor features, they are referred to collectively as the VCX V7111 SIP

Gateway. It is expected that the readers are familiar with regular telephony and data

networking concepts.

Gateway Description

The 3Com VCX V7111 SIP Gateway Series

Analog VoIP gateways are cost-effective,

cutting-edge technology solutions, providing superior voice quality and optimized packet

voice streaming (voice, fax and data traffic) over the same IP network. These gateways use

the award-winning, field-proven DSP voice compression technology used in other 3Com

series products.

The VCX V7111 SIP Gateway gateways incorporate up to 24 analog ports for connection,

either directly to an enterprise PBX (VCX V7111/FXO), to phones, or to fax (VCX

V7111/FXS), supporting up to 24 simultaneous VoIP calls.

Additionally, the VCX V7111 SIP Gateway units are equipped with a 10/100 Base-TX

Ethernet port for connection to the network.

The VCX V7111 SIP Gateway gateways are best suited for small to medium size

enterprises, branch offices or for residential media gateway solutions.

The VCX V7111 SIP gateways enable Users to make free local or international telephone/fax

calls between the 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 V7111 SIP gateways are very compact devices that can be installed as a desk-top

unit (see Mounting the VCX V7111 on a Desktop

on page 28) or on the wall (see Mounting

the FXO and 2FXS, 4FXS, and 8FXS on a Wall on page 30) or in a 19-inch rack (see

Installing the FXO and 2FXS, 4FXS, and 8FXS in a 19-inch Rack

on page 29 and Installing

the 24FXS in a 19-inch Rack on page 29).

The VCX V7111 SIP gateways support SIP or H.323 protocols, enabling the deployment of

“voice over IP” solutions in environments where each enterprise or residential location is

provided with a simple media gateway.

This provides the enterprise with a telephone connection (e.g., RJ-11), and the capability to

transmit the voice and telephony signals over a packet network.

The 24FXS supports up to 24 analog telephone loop start FXS ports, shown in Figure 1

.

14 3Com VCX V7111 VoIP SIP Gateway User Manual

Figure 1 24FXS Gateway Front View

The 8FXS and 8FXO support up to 8 analog telephone loop start FXS or FXO ports, shown

in Figure 2

.

Figure 2 8FXS and 8FXO Gateway Front View

The 4FXS and 4FXO support up to 4 analog telephone loop start FXS or FXO ports, shown

in Figure 3

.

Figure 3 4FXS and 4FXO Gateway Front View

The 2FXS supports up to 2 analog telephone loop start FXS ports, shown in Figure 4

.

3Com VCX V7111 VoIP SIP Gateway User Manual

15

Figure 4 2FXS Gateway Front View

The layout diagram (see Figure 5

), illustrates a typical FXO or 2FXS, 4FXS, or 8FXS VoIP

application.

16 3Com VCX V7111 VoIP SIP Gateway User Manual

Figure 5 Typical VCX V7111 SIP VoIP Application

SIP Overview

SIP (Session Initialization Protocol) is an application-layer control (signaling) protocol used

on the VCX V7111 SIP 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.

3Com VCX V7111 VoIP SIP Gateway User Manual

17

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

for use by Proxy servers. SIP, on the VCX V7111, complies with the IETF (Internet

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

).

VCX V7111 Supported Features

This section provides a high-level overview of some of the VCX V7111 features.

General Features

 Superior, high quality Voice, Data and Fax over IP networks.

 Spans a range of 2–24 analog ports.

 Supports analog telephone sets or analog PSTN/PBX trunk lines (FXS/FXO).

 Connected to the IP network via a 10/100 Base-TX Ethernet interface.

 Selectable G.711 or Low Bit Rate (LBR) coders per channel.

 T.38 Fax with superior performance (handles a round-trip delay of up to 9 seconds).

 Echo Canceler, Jitter Buffer, Voice Activity Detection (VAD) and Comfort Noise

Generation (CNG) support.

 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

 24FXS 19-inch, 1 U rugged enclosure provides up to 24 analog FXS ports, using a single

50 pin Telco connector.

 FXO and 2FXS, 4FXS, and 8FXS compact, rugged enclosure only one-half of a 19-inch

rack unit, 1 U high (1.75" or 44.5 mm).

 24FXS devices: optional AC or DC power supply.

 Lifeline - provides a wired phone connection to PSTN line when there is no power, or the

network fails (applies to 2FXS, 4FXS, and 8FXS gateways).

 LEDs on the front and rear panels that provide information on the operating status of the

media gateway and the network interface.

 Restart button on the Front panel that restarts the VCX V7111 gateway, and is also used

to restore the VCX V7111 parameters to their factory default values.

SIP Features

The VCX V7111 SIP gateway complies with RFC 3261 IETF standard.

 Reliable 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.

18 3Com VCX V7111 VoIP SIP Gateway User Manual

 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 V7111

automatically switches to a redundant Proxy.

 Supports Proxy server discovery using DNS SRV records.

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

Digest methods.

 Single gateway Registration or multiple Registration of all gateway endpoints.

 Configuration of Authentication Username and Password per each gateway endpoint, or

single username and password per gateway.

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

REFER, NOTIFY, PRACK, UPDATE and SUBSCRIBE.

 Modifying connection parameters in a call (re-INVITE).

 Working with 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.

 Call Forward (using 302 response): Immediate, Busy, No reply, Busy or No reply, Do Not

Disturb.

 Session Timer <draft-ietf-sip-session-timer-13.txt>.

 Supports network asserted identity and privacy (RFC 3325 and RFC 3323).

 Supports Tel URI (Uniform Resource Identifier) according to RFC 2806 bis.

 Remote party ID <draft-ietf-sip-privacy-04.txt>.

 Obtaining Proxy Domain Name(s) from DHCP according to RFC 3361.

 RFC 2833 Relay for 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>.

 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.

 Can negotiate coder from a list of given coders.

 Implementation of Message Waiting Indication (MWI) IETF draft-ietf-sipping-mwi-04.txt,

including SUBSCRIBE (to MWI server). The VCX V7111/FXS gateways can accept an

3Com VCX V7111 VoIP SIP Gateway User Manual

19

MWI Notify message that indicates waiting messages or indicates that the MWI is

cleared.

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

 Supports RFC 3581 – Symmetric Response Routing.

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

VCX V7111 SIP VoIP Gateway Release Notes.

20 3Com VCX V7111 VoIP SIP Gateway User Manual

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