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

2. 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

3. SIP and H.323

4. SIP addresses food chain

5. SIP protocol text based (~ HTTP) methods

6. SIP operation in redirect mode

7. SIP operation in proxy mode

8. 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)

9. For more information... http://www.cs.columbia.edu/~hgs/sip IETF MMUSIC mailing list: confctrl-request@isi.edu