Chapter 7. How to configure SIP
Ingate Firewall provides a lot of SIP possibilities. In this chapter, the most common SIP setups are setup with step-by-step instructions for the configuration.
SIP server on the outside
The simplest SIP scenario is when the SIP server is managed by someone else, and the firewall SIP function is only used to traverse NAT.
Here are the settings needed for this. It is assumed that the firewall already has a network configuration. Only the additional SIP settings are listed.
Basic
Go to the Basic page under SIP and turn the SIP module on. Here you also select log classes for SIP event logging.
Filtering
On the Filtering page, you set the Default policy for requests under Proxy rules to Process all. This means that the firewall will process all SIP requests regardless of which SIP domain they are bound to.
Interoperability
If Windows Messenger is used for SIP communication, you need to set a parameter on the Interoperability page. Set lr=true status to On under Loose routing.
Routing
On the Routing page, you can enter the SIP server managing your SIP domain. Enter the name or IP address of the SIP server under Outbound proxy.
If you enter the server name here, all SIP traffic from the inside will be directed to this server, regardless of where it is bound to.
Basic Configuration
If no Outbound proxy is entered, the firewall must be able to look up SIP domains in DNS. DNS servers are entered on the Basic Configuration page under Basic Configuration.
Save/Load Configuration
Finally, go to the Save/Load Configuration page under Administration and apply the new settings by pressing Apply configuration.
