History
SIP was originally designed by Henning Schulzrinne and Mark Handley in 1996. In November 2000, SIP was accepted as a 3GPP signaling protocol and permanent element of the IP Multimedia Subsystem (IMS) architecture for IP-based streaming multimedia services in cellular systems. The IETF Network Working Group published RFC 3261 - as of 2013 the latest version of the specification - in June 2002.
The U.S. National Institute of Standards and Technology (NIST), Advanced Networking Technologies Division provides a public-domain implementation of the Java standard for SIP which serves as a reference implementation for the standard. The stack can work in proxy server or user agent scenarios and has been used in numerous commercial and research projects. It supports RFC 3261 in full and a number of extension RFCs including RFC 3265 (Subscribe / Notify) and RFC 3262 (Provisional Reliable Responses) etc.
Read more about this topic: SIP Connection
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