http://www.articleheaven.net en-us editorial@articlealley.com SIP Trunking is one of the effective ways if you need to upgrade your existing telephone system. In this technology, you are able to connect the existing PBX system of your organization to the internet with the help of a soft-switch called SIP. In simple ... http://www.articleheaven.net/benefits-of-sip-trunking-2105504.html 10th March 2011