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SIP extensions for the IP Multimedia Subsystem
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<p> The Session Initiation Protocol (SIP) is the signaling protocol selected by the 3rd Generation Partnership Project (3GPP) to create and control multimedia sessions with multiple participants in the IP Multimedia Subsystem (IMS). It is therefore a key element in the IMS framework. </p><p>SIP was developed by the Internet Engineering Task Force (IETF) as a standard for controlling multimedia communication sessions in Internet Protocol (IP) networks. It is characterized by its position in the application layer of the Internet Protocol Suite. Several SIP extensions published in Request for Comments (RFC) protocol recommendations, have been added to the basic protocol for extending its functionality. </p><p>The 3GPP, which is a collaboration between groups of telecommunications associations aimed at developing and maintaining the IMS, stated a series of requirements for SIP to be successfully used in the IMS. Some of them could be addressed by using existing capabilities and extensions in SIP while, in other cases, the 3GPP had to collaborate withe IETF to standardize new SIP extensions to meet the new requirements. The IETF develops SIP on a generic basis, so that the use of extensions is not restricted to the IMS framework. </p>