http://www.articleheaven.net en-us editorial@articlealley.com What is SIP and what does it have to do with the phone that you use? It is Session Initiation Protocol and it can establish sessions for features such as audio, videoconferencing, and call forwarding to be deployed over IP networks, enabling service provi... http://www.articleheaven.net/sip-phone-brings-it-all-together-893680.html 15th May 2009