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...
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Principle
SIP messages
References
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