Using siproxd to allow VoIP through a firewall
Session Initiation Protocol (SIP) is a popular open standard for implementing Voice over Internet Protocol (VoIP) telephone calls. Siproxd is a SIP proxy server that can help you with network connectivity issues for SIP clients behind firewalls.
One major reason that you might use siproxd is to get around network address translation issues with SIP. Siproxd can run on a firewall machine that is directly connected to the Internet, meaning no address translation is needed. Clients on the intranet behind the firewall can then connect to siproxd.
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