Administrator's Guide

Chapter 4. How To Conﬁgure SIP

3Com VCX IP Telecommuting Module provides a lot of SIP possibilities. In this chapter,

the most common SIP setups are setup with step-by-step instructions for the conﬁguration.

DMZ Telecommuting Module, SIP server on

the WAN

The simplest SIP scenario is when the SIP server is managed by someone else, and the

Telecommuting Module SIP function is only used to traverse NAT.

Note that the Telecommuting Module must have a public (non-NATed) IP address for the

SIP signaling to work correctly.

Here are the settings needed for this. It is assumed that the Telecommuting Module already

has a network conﬁguration. Only the additional SIP settings are listed.

Networks and Computers

The Telecommuting Module must know the network structure to be able to function properly.

On the Networks and Computers page, you deﬁne all networks which the Telecommuting

Module should serve and which are not reached through the default gateway of the ﬁrewall.

All computers that can reach each other without having to go through the ﬁrewall connected

to the Telecommuting Module should be grouped in one network.

You can also deﬁne networks and parts of networks for other conﬁguration purposes.