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Article | REF: TE7530 V1

SIP protocol

Author: François TOUTAIN

Publication date: November 10, 2003 | Lire en français

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    1. Principle

    The SIP protocol [2] is the result of an approach dedicated to telephone signaling over the Internet within the MMUSIC (Multimedia Multiparty Session Control) group [1] .

    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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