Appendix A Nat Router Requirements For Nat Traversal Feature; Contents; Description - Avaya Nortel Communication Server 1000 Manual

Appendix A
NAT router requirements for NAT
Traversal feature

Contents

This section contains the following topics:
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Description

This appendix describes the requirements of a Network Address Translation
(NAT) router to enable it to support the NAT Traversal feature.
For a NAT device to work correctly between an IP Phone and the CS 1000
system, the following requirements must be met:
1. A cone NAT must be used.
2. The Private-to-Public mapping should have a long time-out configured.
3. If multiple IP Phones are supported behind the same NAT router,
4. The Private-to-Public mapping created by a NAT router must be kept
5. The IP Phone must be running the correct minimum firmware version
Most of the issues encountered can be confirmed using either an IP Phone
behind the NAT device or a PC running the third-party tool "natcheck".
Nortel is not affiliated in any manner with the natcheck tool, and therefore is not
liable or responsible for any problems that may be encountered with this tool.
Copyright © 2003–2008, Nortel Networks
.
"Description" (page 525)
"Requirements" (page 526)
"Natcheck output" (page 528)
hairpinning must be supported.
alive by packets in only one direction (standard in most NAT routers).
(not a NAT device requirement, but still important).
Nortel Communication Server 1000
IP Line Fundamentals
NN43100-500 02.02 Standard
Release 5.5 4 February 2008
ATTENTION
525