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IETF Session Initiation Protocol

The Session Initiation Protocol (SIP) is a lightweight signaling protocol designed for initiating, managing, and terminating multimedia communication sessions. Standardized within the IETF MMUSIC working group, SIP facilitates both multicast and unicast communication, enabling personal mobility and flexible media changes. It supports features like call forwarding, resource reservation, and distinctive ringing. SIP operates over UDP or TCP and utilizes a text-based format similar to HTTP, making it suitable for deployment in intelligent networks. For detailed information, visit http://www.cs.columbia.edu/~hgs/sip.

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IETF Session Initiation Protocol

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  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

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