SIP is designed to provide signaling and session management for voice and multimedia connections over packet-based networks. Since then, much work has been done, and numerous RFCs have been published to solidify and extend SIP capabilities. The first SIP RFC, number 2543, was published in 1999. The Session Initiation Protocol (SIP) is an Internet Engineering Task Force (IETF) standard call control protocol, based on research at Columbia University by Henning Schulzrinne and his team.
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