openSIPS

openSIPS is a SIP proxy and server for voice, video, instant messaging, presence, and other SIP extensions. It is for network admins, service operators, and teams that run services based on SIP. Its scope goes beyond voice calls. A team can also use it for SIP video, instant messaging (IM), presence, and added SIP extensions. The program can fill a proxy or server role in a SIP setup. This range may help teams that handle several kinds of SIP communication. The main limit is its protocol scope. openSIPS is for SIP services and extensions, so it is not a fit for systems that do not use SIP. Teams should first check that their voice, video, IM, or presence setup uses SIP. They should also check that any extra functions are SIP extensions.