Nortel VoIP Gateway User manual

Part No. P0606298 02
August 11, 2003
Norstar VoIP Gateway
Configuration Guide

2
P0606298 02
Copyright © 2003 Nortel Networks
All rights reserved.
The information in this document is subject to change without notice. The statements, configurations, technical data, and
recommendations in this document are believed to be accurate and reliable, but are presented without express or implied
warranty. Users must take full responsibility for their applications of any products specified in this document. The
information in this document is proprietary to Nortel Networks NA Inc.
Trademarks
NORTEL NETWORKS, Norstar and Meridian are trademarks of Nortel Networks.
Microsoft, MS, MS-DOS, Windows, and Windows NT are registered trademarks of Microsoft Corporation.
All other trademarks and registered trademarks are the property of their respective owners.

3
Norstar VoIP Gateway Configuration Guide
Contents
Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Before you begin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Symbols used in this guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Text conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Acronyms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Related publications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
How to get help . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Presales Support (CSAN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Chapter 1
About Norstar VoIP Gateway. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
VoIP Gateway key features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Supported H.323 features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Chapter 2
IP Telephony overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Key IP telephony concepts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
VoIP trunks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
VoIP trunks and analog/digital telephones . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Gatekeepers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Codecs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Jitter Buffer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
QoS routing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
Prerequisites checklist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Network diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Network devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Network assessment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
Chapter 3
Configuring the VoIP Gateway . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Computer requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Accessing the web interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Configuring the Protocol Definition parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Configuring the Registration Prefixes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Configuring the Number Manipulation tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Number Manipulation overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Basic Concepts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Configuring number manipulation for Destination Phone Numbers for Norstar to IP calls 46
Configuring number manipulation for Digit Delivery . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Configuring number manipulation for Source Phone Numbers for IP to Norstar calls . . 52
Configuring number manipulation for Source Phone Numbers for Norstar to IP calls . . 55

4Contents
P0606298 02
Configuring the Channels to Hunt Group parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Configuring the Automatic Dialing phone numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Configuring the Caller ID Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Configuring the Telephone to IP Routing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Configuring the IP to Hunt Group Routing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Configuring Call Forwarding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
Configuring the Network Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
Configuring the Channel Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
Configuring the VoIP Gateway time and date . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
Chapter 4
Configuring the VoIP Gateway using the INI file . . . . . . . . . . . . . . . . . . . . . . . . . 85
Retrieving the INI file from the VoIP Gateway . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
Loading the INI file on the VoIP Gateway . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
Contents of the INI file . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
Basic, Logging and Web parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
Channel parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
H.323 Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
The INI file structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105
The INI file structure rules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105
The INI file example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
Using VoIP Gateway features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
Chapter 5
Configuring the Norstar system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
Configuring your Norstar KSU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
Required Norstar hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
Configuring the trunks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
Configuration tips . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112
Configuring the Norstar system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112
Shared line settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112
Dedicated lines settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114
Example configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117
Configuring a simple Norstar network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118
Setting up the dialing plan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119
Setting up the Norstar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119
Setting up the VoIP Gateway dialing plan – Hunt Groups . . . . . . . . . . . . . . . . . . . 120
Setting up the VoIP Gateway dialing plan – IP Routing Table . . . . . . . . . . . . . . . . . 120
Setting up the VoIP Gateway dialing plan – Caller ID table . . . . . . . . . . . . . . . . . . 121
Setting up the VoIP Gateway dialing plan – Number Type . . . . . . . . . . . . . . . . . . . 122
Setting up the VoIP Gateway dialing plan – Digit Delivery . . . . . . . . . . . . . . . . . . . 122
Setting up the VoIP Gateway dialing plan – destination Hunt Group assignment . 123
Setting up the VoIP Gateway – Fast Start parameters . . . . . . . . . . . . . . . . . . . . . . 124

Contents 5
Norstar VoIP Gateway Configuration Guide
Setting up the VoIP Gateway – H.323 parameters . . . . . . . . . . . . . . . . . . . . . . . . . 124
Setting up the VoIP Gateway to control the Call Progress Tone . . . . . . . . . . . . . . . 125
Setting up the VoIP Gateway to enable end to end DTMF tones . . . . . . . . . . . . . . . . . 125
Setting up the VoIP Gateway to use a RAD over VoIP trunks . . . . . . . . . . . . . . . . . . . . 126
Connections required for the RAD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126
Configuring the VoIP Gateway . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126
Setting up the VoIP Gateway for T.38 Fax Relay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127
Enabling Fax support on the VoIP Gateway . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127
Setting up the dialing plan on the VoIP Gateway . . . . . . . . . . . . . . . . . . . . . . . . . . 128
Setting up the VoIP Gateway to use a Radvision Gatekeeper . . . . . . . . . . . . . . . . . . . 129
Configuring the H.323 Protocol Definition settings . . . . . . . . . . . . . . . . . . . . . . . . . 129
Configuring the Gatekeeper Registration of the dialing plan . . . . . . . . . . . . . . . . . 130
Configuring the Business Communications Manager as an endpoint . . . . . . . . . . . . . . 130
Considerations with Business Communications Manager . . . . . . . . . . . . . . . . . . . 130
Considerations when using a Meridian 1 IPT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131
Considerations when using a CSE1K Gatekeeper . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131
Chapter 6
Changing the VoIP Gateway password . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133
Chapter 7
Upgrading the VoIP Gateway . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135
Upgrading the software on the VoIP Gateway . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136
Loading the software file . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136
Loading a configuration file . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137
Backing up the VoIP Gateway configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137
Restoring the VoIP Gateway configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138
Chapter 8
Diagnostics and Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139
VoIP Gateway LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139
VoIP Gateway Self-Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140
Rapid self-test mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140
Detailed self-test mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140
RS-232 terminal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141
Connecting a terminal to the VoIP Gateway . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141
Configuring a terminal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141
Viewing the terminal information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141
SysLog Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142
Sending the SysLog Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143
Setting the SysLog Server IP Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143
Activating the SysLog Client . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 144

6Contents
P0606298 02
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .144
Possible common problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 144
Possible H.323 Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146
Appendix A
Numbering and Dial Plans. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147
Public and Private Numbering Plans . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147
Dialing Plans . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148
Numbering Plans in H.323 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149
Planning Your Numbering Plan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149
Configuring Numbering Plans in the Norstar VoIP Gateway . . . . . . . . . . . . . . . . . . . . . . . . 150
Appendix B
Efficient Networking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 153
Determining the bandwidth requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 153
Determining WAN link resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 153
Link utilization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 153
Network engineering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .154
Bandwidth requirements on half duplex links . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155
Bandwidth requirements on full duplex links . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157
LAN engineering examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158
WAN engineering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 159
Additional feature configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160
Determining network loading caused by IP telephony traffic . . . . . . . . . . . . . . . . . . . . 160
Enough link capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 162
Not enough link capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 162
Other intranet resource considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 162
Implementing the network, LAN engineering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163
Further network analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163
Components of delay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163
Reducing link delay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164
Reducing hop count . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164
Adjust the jitter buffer size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164
Reduce packet errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 165
Routing issues . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 165
Post-installation network measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 166
Appendix C
Silence compression . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 167
Silence Compression on Half Duplex Links . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 168
Silence compression on Full Duplex Links . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 170
Comfort noise . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 172

Contents 7
Norstar VoIP Gateway Configuration Guide
Appendix D
Network performance utilities. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 173
Ping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 173
Traceroute . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 173
Sniffer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 174
Appendix E
Interoperability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175
Business Communications Manager . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175
Local Gateway IP Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175
Media Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 176
Remote Gateway . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 177
Meridian 1 ITG / IPT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .178
CSE 1000 Gatekeeper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 178
Adding an H.323 Endpoint . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 178
Setting H.323 Endpoint Dialing Plan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 179
Committing Gatekeeper Configuration Changes . . . . . . . . . . . . . . . . . . . . . . . . . . 180
Programming the VoIP Gateway to work with a CSE 1000 Gatekeeper . . . . . . . . . . . . 180
Radvision Gatekeeper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 181
General Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 181
General Gateway Setup for Radvision ECS Gatekeeper Interoperability . . . . . . . . . . . 182
Setting up the Numbering Plan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 182
Setting up Remote Routers for IP Telephony Prioritization . . . . . . . . . . . . . . . . . . . . . . . . . 184
Creating an outbound traffic filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 184
Sample criteria, ranges, and actions for UDP filtering . . . . . . . . . . . . . . . . . . . . . . 185
Appendix F
Quality of Service. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 187
Measuring Intranet QoS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 187
Measuring end-to-end network delay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 187
Measuring end-to-end packet loss . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 188
Recording routes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 188
Adjusting Ping measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 189
Adjustment for processing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 189
Late packets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 190
Measurement procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 190
Other measurement considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 190
Decision: does the intranet meet IP telephony QoS needs? . . . . . . . . . . . . . . . . . 191
Implementing QoS in IP networks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 191
Traffic mix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 192
TCP traffic behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 192

8Contents
P0606298 02
Appendix G
SNMP Management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 193
SNMP Message Standard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 193
SNMP MIB Objects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 194
SNMP Extensibility feature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 195
VoIP Gateway supported MIBs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 195
Appendix H
Working with H.450 supplementary services . . . . . . . . . . . . . . . . . . . . . . . . . . 197
Call Hold and Retrieve features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 197
Consultation\Alternate feature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 197
Call Transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .198
Call Forward . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 198
Appendix I
Alternate (Redundant) Gatekeeper. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 201
Appendix J
DTMF, Fax and Modem transport modes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 203
DTMF/MF Relay Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 203
Fax/Modem Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 204
Configuring Fax Relay Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 204
Configuring Fax/Modem ByPass Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 205
Supporting V.34 Faxes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 206
Appendix K
Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 207
VoIP Gateway specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 207
Default RTP/RTCP/T.38 Ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 209
Industry standard packet types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 209
VoIP Gateway specific payload types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 210
Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 211
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 215

9
Norstar VoIP Gateway Configuration Guide
Figures
Figure 1 Norstar VoIP Gateway front panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Figure 2 Typical VoIP Gateway application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Figure 3 Web browser login screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Figure 4 Protocol Definition screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Figure 5 Registration Prefixes Table screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Figure 6 Destination Phone Number Manipulation Table for TEL->IP calls screen . . . . . 47
Figure 7 Digit Delivery Table screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Figure 8 Source Phone Number Manipulation Table for IP->TEL calls screen . . . . . . . . 53
Figure 9 Source Phone Number Manipulation Table for TEL->IP calls screen . . . . . . . . 56
Figure 10 End Point’s Phone Number table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Figure 11 Automatic Dialing Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Figure 12 Caller Display Info . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Figure 13 Phone to IP Routing Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Figure 14 IP to Hunt Group Routing Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Figure 15 Call Forward Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
Figure 16 Network Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
Figure 17 Channel Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
Figure 18 Regional Settings screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
Figure 19 Configuration File screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
Figure 20 Configuration File screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
Figure 21 INI File Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105
Figure 22 VoIP Gateway INI file example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
Figure 23 Example of IP to Hunt Group Routing settings for shared lines . . . . . . . . . . . . 113
Figure 24 Example of Digit Delivery Settings for shared lines . . . . . . . . . . . . . . . . . . . . . 114
Figure 25 Example of Channels - Hunt Group settings for dedicated lines . . . . . . . . . . . 115
Figure 26 Example of Caller Display Info settings for dedicated lines . . . . . . . . . . . . . . . 115
Figure 27 Example of IP to Hunt Group Routing Table settings for dedicated lines . . . . . 116
Figure 28 Simple Norstar and VoIP Gateway network . . . . . . . . . . . . . . . . . . . . . . . . . . . 118
Figure 29 Channels - Hunt Group screen for simple Norstar network . . . . . . . . . . . . . . . 120
Figure 30 Tel To IP Routing & IP Security screen for a simple Norstar network . . . . . . . . 121
Figure 31 Caller Display Info screen for a simple Norstar network . . . . . . . . . . . . . . . . . . 121
Figure 32 Destination Phone Number Manipulation Table for TEL->IP calls screen for
a simple Norstar network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122
Figure 33 Digit Delivery Table screen for a simple Norstar network . . . . . . . . . . . . . . . . . 123
Figure 34 IP to Hunt Group Routing Table screen for a simple Norstar network . . . . . . . 124
Figure 35 Using a RAD over the VoIP Gateway . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126
Figure 36 VoIP Gateway with T.38 Fax Relay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127
Figure 37 VoIP Gateway with a Gatekeeper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129
Figure 38 Change Password screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133
Figure 39 RS-232 cable wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141

10 Figures
P0606298 02
Figure 40 Status and Error Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142
Figure 41 E.164 Numbering Plan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147
Figure 42 Example of the Registration Prefixes Table . . . . . . . . . . . . . . . . . . . . . . . . . . . 151
Figure 43 Example Destination Phone Number Manipulation Table . . . . . . . . . . . . . . . . 151
Figure 44 LAN engineering peak transmission . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158
Figure 45 Peak traffic, WAN link . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 159
Figure 46 Calculating network load with IP telephony traffic . . . . . . . . . . . . . . . . . . . . . . 160
Figure 47 Network loading bandwidth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161
Figure 48 One call on a half duplex link without silence compression . . . . . . . . . . . . . . . 168
Figure 49 One call on a half duplex link with silence compression . . . . . . . . . . . . . . . . . 168
Figure 50 Two calls on a half duplex link with silence compression . . . . . . . . . . . . . . . . . 169
Figure 51 One call on a full duplex link without silence compression . . . . . . . . . . . . . . . . 170
Figure 52 One call on a full duplex link with silence compression . . . . . . . . . . . . . . . . . . 171
Figure 53 Two calls on a full duplex link with silence compression . . . . . . . . . . . . . . . . . 172

11
Norstar VoIP Gateway Configuration Guide
Tables
Table 1 Network diagram prerequisites . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Table 2 Network device checklist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Table 3 Network assessment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Table 4 Protocol Definition parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Table 5 Registration Prefixes Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Table 6 Destination Phone Number Manipulation Table for TEL->IP calls (Norstar to IP) 48
Table 7 Digit Delivery Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Table 8 Source Phone Number Manipulation Table for IP->TEL calls (IP to Norstar) . . . 54
Table 9 Source Phone Number Manipulation Table for TEL->IP calls (Norstar to IP) . . . 56
Table 10 End Point’s Phone Numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
Table 11 Call Forward parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
Table 12 Network Settings Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
Table 13 Channel Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
Table 14 Basic and Logging parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
Table 15 Channel parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
Table 16 H.323 Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
Table 17 Using the VoIP Gateway features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
Table 18 Norstar trunk configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
Table 19 Dialing plan for simple Norstar network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119
Table 20 Software file types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135
Table 21 Indicator LEDs on the VoIP Gateway front panel . . . . . . . . . . . . . . . . . . . . . . . 139
Table 22 Possible common problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 144
Table 23 Possible H.323 problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146
Table 24 NPI/TON values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149
Table 25 Sample Numbering Plan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150
Table 26 VoIP Transmission Characteristics for unidirectional continuous media stream 154
Table 27 Bandwidth Requirements per Gateway port for half-duplex links . . . . . . . . . . . 156
Table 28 Bandwidth Requirements per Gateway port for Full-duplex links . . . . . . . . . . . 157
Table 29 Link capacity example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 162
Table 30 Norstar VoIP Gateway Product Interoperability Summary . . . . . . . . . . . . . . . . 175
Table 31 Site pairs and routes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 189
Table 32 Computed load of voice traffic per link . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 189
Table 33 Delay and error statistics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 190
Table 34 VoIP Gateway functional specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 207
Table 35 Default RTP/RTCP/T.38 port allocation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 209
Table 36 Industry standard packet types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 209
Table 37 VoIP Gateway specific payload types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 210

12 Tables
P0606298 02

13
Norstar VoIP Gateway Configuration Guide
Preface
The Norstar VoIP Gateway is an accessory for Norstar KSU that provides up to four IP telephony
trunks. These IP telephony trunks allow you to establish voice calls to other IP telephony enabled
telephones systems using a data networking connection. Examples of IP telephony enabled
telephone systems are a Business Communications Manager system, Meridian 1 IPT or another
Norstar KSU equipped with a Norstar VoIP Gateway.
Before you begin
This guide provides information about the configuration and operation of the Norstar VoIP
Gateway. It is intended for persons responsible for the configuration of a Norstar VoIP Gateway
system. Prior knowledge of IP networks is required.
Before using this guide, the Norstar VoIP Gateway must be connected to the Norstar KSU.
This guide assumes:
• You have planned the telephony and data requirements for your Norstar system.
• The Norstar KSU is installed and initialized, and the hardware is working. External lines and
internal telephones and telephony equipment are connected to the KSU or Expansion
Modules.
• Configuration of lines is complete.
• Operators have a working knowledge of the Windows operating system and of graphical user
interfaces.
• Operators who manage the data portion of the system are familiar with network management
and applications.
Symbols used in this guide
This guide uses these symbols to draw your attention to important information:
Caution: Caution Symbol
Alerts you to conditions where you can damage the equipment.
Danger: Electrical Shock Hazard Symbol
Alerts you to conditions where you can get an electrical shock.
Warning: Warning Symbol
Alerts you to conditions where you can cause the system to fail or work improperly.

14 Text conventions
P0606298 02
Text conventions
This guide uses these following text conventions:
Acronyms
This guide uses the following acronyms:
Note: Note/Tip symbol
Alerts you to important information.
Tip: Note/Tip symbol
Alerts you to additional information that can help you perform a task.
angle brackets (< >) Represent the text you enter based on the description inside the
brackets. Do not type the brackets when entering the command.
Example: If the command syntax is
ping <ip_address> , you enter: ping 192.32.10.12
bold Courier text Represent command names, options and text that you need to enter.
Example: Use the dinfo command.
Example: Enter show ip {alerts|routes}.
italic text Represents terms, book titles and variables in command syntax
descriptions. If a variable is two or more words, the words are
connected by an underscore.
Example: The command syntax
show at <valid_route> ,
valid_route is one variable and you substitute one value for it.
bold text Represents fields names, field entries, and screen names in the
configuration application.
plain Courier
text Represents command syntax and system output, such as prompts and
system messages.
Example: Set Trap Monitor Filters
dollar sign ($) The $ symbol indicates hexadecimal notation.
ATM Asynchronous Transfer Mode
CDP Coordinated Dialing Plan
CLID Calling Line Identification
CIR Committed Information Rate
CNG Comfort Noise Generation
ECM Error Correction Mode

Related publications 15
Norstar VoIP Gateway Configuration Guide
Related publications
Documents referenced in the Norstar VoIP Gateway Configuration Guide include:
• Norstar Installer Guide
• Norstar System Coordinator Guide
• Norstar VoIP Gateway Installation Guide
ICMP Internet Control Message Protocol
IEEE802 ESS Institute of Electrical and Electronics Engineers, Inc., standard 802
Electronic Switching System Identification code
IP Internet Protocol
ISDN Integrated Services Digital Network
LAN Local Area Network
LATA Local Area and Transport Area
MCR Maximum Cell Rate
MOS Mean Opinion Score
PCM Pulse Code Modulation
PING Packet InterNet Groper
PPP Point-to-Point Protocol
PRI Primary Rate Interface
PSTN Public Switched Telephone Network
QoS Quality of Service
RAS Registration, Admissions and Status
RTP Real-time Transfer Protocol
SNMP Simple Network Management Protocol
TCP Transmission Control Protocol
UDP User Datagram Protocol
UDP Universal Dialing Plan
VoIP Voice over Internet Protocol
VAD Voice Activity Detection
VLAN Virtual LAN
WAN Wide Area Network

16 How to get help
P0606298 02
How to get help
USA and Canada
Authorized Distributors - ITAS Technical Support
Telephone:
1-800-4NORTEL (1-800-466-7835)
If you already have a PIN Code, you can enter Express Routing Code (ERC) 196#.
If you do not yet have a PIN Code, or for general questions and first line support, you can enter
ERC 338#.
Website:
http://www.nortelnetworks.com/support
Presales Support (CSAN)
Telephone:
1-800-4NORTEL (1-800-466-7835)
Use Express Routing Code (ERC) 1063#
EMEA (Europe, Middle East, Africa)
Technical Support - CTAS
Telephone:
00800 800 89009
Fax:
44-191-555-7980
email:
[e-mail]
CALA (Caribbean & Latin America)
Technical Support - CTAS
Telephone:
1-954-858-7777
email:
[e-mail]
APAC (Asia Pacific)
Technical Support - CTAS
Telephone:
[phone]
Fax:
[phone]
email:
[e-mail]

17
Norstar VoIP Gateway Configuration Guide
Chapter 1
About Norstar VoIP Gateway
The VoIP Gateway provides excellent voice quality and optimized packet voice streaming over IP
networks. The product enables voice, fax and data traffic to be sent over the same IP network.
The VoIP Gateway incorporates up to four ports for connection to analog trunk ports on a Norstar
KSU or to a fax. These ports supports up to four simultaneous VoIP calls.
Additionally, the VoIP Gateway is equipped with a 10/100 Base-T Ethernet port for connection to
the LAN.
With the VoIP Gateway you can:
• network your Norstar system to another Norstar system or other Nortel Networks Enterprise
communications systems using the IP network
• use your IP network to replace PSTN or other costly private network trunking between
locations
• use the capacity of the enterprise data network for voice and avoid costly access and long
distance charges.
The VoIP Gateway is a very compact device, designed to be installed on a desk-top, on the wall, or
in a 19-inch rack.
The VoIP Gateway supports the H.323 ITU protocol, enabling the deployment of "voice over
packet" solutions in environments where each enterprise location is provided with a simple Media
Gateway. This provides the enterprise with the ability to transmit the voice and telephony signals
over a packet network.
The layout diagram, Figure 2 on page 18, illustrates a typical VoIP Gateway application.
Figure 1 Norstar VoIP Gateway front panel
C h a n n e l s
1 2 3 4
Data
LAN
Control
Ready
VoIP Gateway

18
P0606298 02
Figure 2 Typical VoIP Gateway application
VoIP Gateway key features
• high quality voice, data and fax over IP networks
• supports up to 4 analog telephone loop start ports
• connected to the IP network via a 10/100 Base-T Ethernet interface
• codecs include: G.711, G.723.1, G.729A
• T.38 Fax with superior performance (can handle a round trip delay up to 9 sec.)
• compliant with H.323 (Version 4)
C h a n n e l s
1 2 3 4
Data
LAN
Control
Ready
VoIP Gateway
C h a n n e l s
1 2 3 4
Data
LAN
Control
Ready
VoIP Gateway
C h a n n e l s
1 2 3 4
Data
LAN
Control
Ready
VoIP Gateway
Internet
Router
Router
Router
VoIP Gateway VoIP Gateway
VoIP Gateway
Head Office
Modular ICS
Branch Office
Modular ICS
Branch Office
Compact ICS

19
Norstar VoIP Gateway Configuration Guide
• Emergency Line, connected to the unused pins on port #4, with a relay to an analog line, even
if the VoIP Gateway is powered off.
• LEDs on the front and rear panels that provide information on the operating status of the VoIP
Gateway and the network interface
• Restart button on the front panel that restarts the VoIP Gateway
• compact, rugged enclosure only one-half of a 19-inch rack unit, 1 U high (1.75" or 44.5 mm)
• mounting option of installing two VoIP Gateway in a single 19-inch rack shelf, one U high
(1.75" or 44.5 mm).
Supported H.323 features
The VoIP Gateway implements the RadVision™ H.323 version 4.0 protocol stack. In this version,
the VoIP Gateway features the following:
Gatekeeper
• Works without a Gatekeeper using the internal phone table.
• Registers to a known Gatekeeper.
• Supports Gatekeeper registration with prefixes
• Functions as an H.323 gateway or can imitate an H.323 terminal with up to four aliases.
• Uses routed-mode calls.
• Uses direct-mode calls.
• Uses redundant Gatekeepers if a redundant Gatekeeper is defined.
• Can fallback to internal routing table if there is no communication with the Gatekeeper.
• Supports the "TimeToLive" parameter. The VoIP Gateway sends Registration requests up to
"TimeToLive" expiration.
• Supports IRR messages for KeepAlive.
• Supports the mapping of destination (Alias) numbers in the ACF message by the Gatekeeper.
• Supports RAI (Resource Available Indication) messages, informing gatekeeper that the
gateway resources are below a threshold.
Call setup
• Can use the Normal Connect procedure.
• Can use the Fast Connect procedure with or without immediately opening a H.245 channel.
• Can use Tunneling.
• Can negotiate a codec from a list of given codecs for Normal or Fast Connect procedures.
• Can open a H.245 channel when using Fast Connect.

20
P0606298 02
Other:
• Supports using a Country Code (0xB5) and Manufacturers Code (0x28) in H.323 messages
• Supports H.323 Annex D, T.38 real time FAX.
• Supports H.450 Call Hold, Call Transfer and Call Forwarding supplementary services
(H.450.1, H.450.2, H.450.3 and H.450.4).
• Supports the following codecs: G.711 A-law, G.711 µ-law, G.723.1 (6.3 kbps, 5.3 kbps), G.729.
• Supports DTMF and HookFlash signal out of band using the H.245 channel (using the
"Alphanumeric" field).
• Supports DTMF out of band using H.225/Q.931 keypad facility messages.
• Supports of one or two stage dialing for network to VoIP Gateway calls.
• Supports reopening of logical channel and implementation of empty terminal capability set.
• Supports configurable H.323 Port Range.
• Supports H.225/Q.931 Progress Indicator parameter for Fast Connect, enabling playing of
local ringback tone or to cut through the voice channel to listen to remote call progress tones/
messages.