4. IETF standards: SIP
SIP (Session Initiation Protocol)
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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IETF standards: SIP
MGCP architecture
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