Chapter 4. How To Configure SIP
3ComVCX IP Telecommuting Module provides a lot of SIP possibilities. In this chapter, the most common SIP
setupsare setup with step-by-step instructions for the configuration.

DMZ Telecommuting Module, SIP server on the outside

Thesimplest SIP scenario is when the SIP server is managed by someone else, and the Telecommuting Module SIP
functionis only used to traverse NAT.
Notethat the Telecommuting Module must have a public (non-NATed)IP address for the SIP signaling to work
correctly.
Hereare 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

TheTelecommuting Module must know the network structure to be able to function properly. On the Networks
andComputers page, you define all networks which the Telecommuting Module should serve and which are not
reachedthrough the default gateway of the firewall. All computers that can reach each other without having to go
throughthe firewall connected to the Telecommuting Module should be grouped in one network.
Youcan also define networks and parts of networks for other configuration purposes.
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