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a Portal devoted to SIP and surrounding technologies
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This Web site is primarily based on the standardization work carried out at the IETF. Its purpose
is to contribute to the
promotion and knowledge of SIP and surrounding technologies.
SIP -- Session Initiation Protocol -- is an "Internet" application-layer protocol
that runs in User Agent and Server Systems for controling multimedia sessions between
users, who may move from one location to another, and use terminal devices with
various media capabilities.
SIP runs on top of TCP, UDP or SCTP transport protocols, and uses the services
provided by other Internet application-layer protocols such as DNS, TLS, IPsec...
SIP is promising because of its natural integration in the IP world, its evolutivity,
and its flexibility. SIP is a key enabler for successful converging services involving
also HTTP, RTSP and SMTP in a same application.
SIP has also been selected by the 3GPP
(third generation partnership project) as a major component of IMS
(IP Multimedia Subsystem) for the evolved UMTS core network.
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