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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 outside
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.
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