Editing Session Initiation Protocol (section)

==History==
SIP was originally designed by [[Mark Handley (computer scientist)|Mark Handley]], [[Henning Schulzrinne]], [[Eve Schooler]] and [[Jonathan Rosenberg (SIP author)|Jonathan Rosenberg]] in 1996 to facilitate establishing [[multicast]] multimedia sessions on the [[Mbone]]. The protocol was standardized as {{IETF RFC|2543}} in 1999. 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 network]]s.  In June 2002 the specification was revised in {{IETF RFC|3261}}<ref>{{cite web|url=http://www.ietf.org/dyn/wg/charter/sipcore-charter.html |title=SIP core working group charter |publisher=[[Internet Engineering Task Force]] |date=2010-12-07 |access-date=2011-01-11}}</ref> and various extensions and clarifications have been published since.<ref>{{cite web|title=Search Internet-Drafts and RFCs|url=https://datatracker.ietf.org/doc/search/?name=SIP&rfcs=on&sort=date|publisher=[[Internet Engineering Task Force]]}}</ref>

SIP was designed to provide a signaling and call setup protocol for IP-based communications supporting the call processing functions and features present in the [[public switched telephone network]] (PSTN) with a vision of supporting new multimedia applications. It has been extended for [[video conferencing]], [[streaming media]] distribution, [[instant messaging]], [[presence information]], [[file transfer]], [[Internet fax]] and [[online game]]s.<ref name="What is SIP?">{{cite web|title=What is SIP?|url=http://www.networkworld.com/article/2332980/lan-wan/what-is-sip-.html|archive-url=https://web.archive.org/web/20140624044447/http://www.networkworld.com/article/2332980/lan-wan/what-is-sip-.html|url-status=dead|archive-date=June 24, 2014|publisher=[[Network World]]|date=May 11, 2004}}</ref><ref name="RFC 3261">{{cite IETF|rfc=3261 |title=SIP: Session Initiation Protocol |year=2002}}</ref><ref>{{cite web |first=Margaret|last=Rouse |title=Session Initiation Protocol (SIP) |url=http://searchunifiedcommunications.techtarget.com/definition/Session-Initiation-Protocol |publisher=[[TechTarget]]}}</ref>

SIP is distinguished by its proponents for having roots in the Internet community rather than in the [[telecommunications industry]]. SIP has been standardized primarily by the [[Internet Engineering Task Force]] (IETF), while other protocols, such as [[H.323]], have traditionally been associated with the [[International Telecommunication Union]] (ITU).