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.
A typical setup for providing Internet access on a home network is to have a single host exposed to the Internet that provides a Web proxy and email services. In such a setup network packets are not allowed to be sent directly to the Internet from machines on the intranet. In this situation siproxd can allow desktop machines to use SIP while maintaining the security offered by a firewall that does not directly forward any network packets to the Internet.
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