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Protocol: SIP (Session Initiation Protocol)
Specified by IETF SIP Working Group. It was to provide a signaling and
call setup (initiate, modify, terminate) protocol for IP-based
communications
SIP is the next great protocol of Internet because it brings an entirely new
set of media and collaboration capabilities to applications, “converged
applications”, including instant messaging, voice/video telephony, video
conferencing, rich-media enterprise collaboration, click-to-call…
In developing SIP-based applications and networks, it got simplicity,
interoperability, scalability, fault tolerance… rather than H.323 that has
architecture designed for “Old World”, PSTN (circuit-switched network).
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