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Article | REF: H5365 V1

Telephony on IP

Authors: Frédéric RÉMI, Cyril TESSEREAU

Publication date: April 10, 2007

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4. IETF standards: SIP

SIP (Session Initiation Protocol) [9] is an IETF standard (see Box 3) defining the signaling part of multimedia transport over IP, i.e. an application-layer control protocol. This is a command-line protocol (like other IETF standards such as SMTP, HTTP or Telnet, SIP messages are text-encoded).

Like H.323, only signaling control is specified: multimedia data itself transits via standard RTP sessions.

One of the special features of SIP, in relation to its signaling capabilities, is the integration of mobility capabilities. These capabilities are obtained by decoupling the notion of number from that of terminal.

More than a number, the terminal identifier handled by SIP is an address designed on the model of e-mail...

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