IETF Session Initiation Protocol Henning Schulzrinne Columbia University New York, NY

SIP Overview Lightweight signaling protocol –to be standardized within IETF MMUSIC –invite to new and on-going conferences –multicast and unicast (“telephony”) –personal mobility –call center: reach first, first all –change and add media –post dial delay: 1.5 RTT –uses either UDP or TCP

SIP and H.323

SIP addresses food chain

SIP protocol text based (~ HTTP) methods

SIP operation in redirect mode

SIP operation in proxy mode

SIP for Intelligent Networks IN services “inside” & “outside” network UPN: translation by redirect server call forwarding: proxy, end system call transfer: BYE distinctive ringing: end system 800#: charging responsibility of resource reservation call center (queueing, first available)

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