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SIP (Session Initiation Protocol)

SIP is supported by practically every manufacturer of IP Phone, Gateway, Call Manager, and IP PBX. It is part of the IP Multimedia Subsystem (IMS). It is powering the fastest growing VoIP residential and enterprise providers. It is a part of PC operating systems and has been enthusiastically adopted by the open source movement.

Besides all these applications and uses, SIP is also generating its own ecosystem. In the same way that the Internet opened up networking by displacing closed, proprietary networking protocols, SIP has opened up communications and displaced closed and proprietary signaling protocols. It has created an entire ecosystem of interoperable and configurable devices and services that is revolutionizing the way communications is done.