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Originally SIP was invented by Henning Schulzrinne and is specified in the RFC 3261 of the IETF SIP Working Group. In November 2000 it was accepted as a 3GPP signaling protocol and permanent element of the IMS architecture. It is largely used as signaling protocol for Voice over IP, along with H.323 and others.

Basically SIP is used in setting up and tearing down voice or video calls and customers usually use TCP and UDP port 5060 to connect to SIP servers and other SIP end points. It can also be used in any application where session initiation is essential. All voice/video communications are done over separate session protocols known as RTP.

The main aim of SIP is to provide a signaling and call setup protocol for IP-based communications which supports functions and features present in the public switched telephone network. It does not describe the features but focus on call-setup and signaling.

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