IETF Session Initiation Protocol Henning Schulzrinne Columbia

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 60 pages multicast signaling personal mobility, IN services any session description SSL, HTTP security H.323 200 pages (without ASN.1) Not (yet) H.245 1 audio, video in progress

SIP addresses food chain yellow pages common names host-independent host-specific “president of the United States” “Bill Clinton, Whitehouse” IP address 198.137.241.30 [email protected] sip://[email protected] sip:// [email protected]

SIP protocol text based ( HTTP) methods INVITE CONNECTED BYE REGISTER UNREGISTER call user confirm connection tear down call transfer call sign up with server “leave” server

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)

For more information. http://www.cs.columbia.edu/ hgs/sip IETF MMUSIC mailing list: [email protected]