My SIP Switch
A SIP signalling consolidation tool that allows multi-user management of diverse SIP providers and allows central management of any SIP based VoIP service. Included in this project are a SIP Stack, SIP Registrar, SIP Registration UAC, SIP Stateful Proxy, STUN Server and more. The components are all written in C#. This project is currently being used to provide the live service at : http://www.mysipswitch.com. My SIPSwitch enables you to take advantage of 5, 10 or 20 different SIP Providers anywhere in the World. This will allow you to tailor fit a VoIP service to meet your needs from several different providers, thus guaranteeing you the best call rates possible.
Go to http://www.codeplex.com/mysipswitch
See also these related projects.