1. Principle
The SIP protocol
It integrates address transformation, user location, call set-up and call management functions, including capacity negotiation (supported flow formats and their parameter settings).
1.1 SIP components
SIP defines two components, both of which can implement either a request preparation service or a request processing service: the protocol is therefore client-server.
The first component is called the User Agent (UA). The UA is a terminal system, available to a user and providing two functionalities:
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Principle
SIP messages
References
- (1) - HANDLEY (M.), CROWCROFT (J.), BORMANN (C.), OTT (J.) - The Internet Multimedia Conferencing Architecture - . Internet Draft draft-ietf-mmusic-confarch-03.txt (expiration janvier 2001).
- (2) - HANDLEY (M.), SCHULTZRINNE (H.), SCHOOLER (E.), ROSENBERG (J.) - SIP : Session Initiation Protocol - ....
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