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Improving the Routing Efficiency of SIP Instant Message SIP 即時傳訊之繞送效能研究

Improving the Routing Efficiency of SIP Instant Message SIP 即時傳訊之繞送效能研究. adviser ： Quincy Wu speaker ： Wenping Zhang date ： 2008.03.13. Outline. Introduction Messaging Schemes Page-mode SIP/SDP Session-mode MSRP SIP Server Message syntax Method SDP Structure Drawback MSRP

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Improving the Routing Efficiency of SIP Instant Message SIP 即時傳訊之繞送效能研究

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  1. Improving the Routing Efficiency of SIP Instant MessageSIP即時傳訊之繞送效能研究 adviser ：Quincy Wu speaker：Wenping Zhang date：2008.03.13

  2. Outline • Introduction • Messaging Schemes • Page-mode • SIP/SDP • Session-mode • MSRP • SIP • Server • Message syntax • Method • SDP • Structure • Drawback • MSRP • Method • Future Work • Reference

  3. Introduction 1/2

  4. Introduction 2/2

  5. Messaging Schemes 1/2 • Page-mode messaging • That track only individual messages can be described. • Uses the SIP Method MESSAGE for transmitting data. User 1 User 2

  6. Messaging Schemes 2/2 • Session-mode messaging • Messaging that is part of a "session" with a definite start and end. • The new proposed model by SIMPLE work group using MSRP Protocol. Proxy SIP SIP MSRP User 1 User 2

  7. Session Initiation Protocol (SIP) • A signaling protocol • The setup, modification, and tear-down of multimedia sessions • SIP + SDP • Describe the session characteristics • Separate signaling and media streams

  8. SIP Server • Proxy servers • Handle requests or forward requests to other servers • Can be used for call forwarding, time-of-day routing, or follow-me services

  9. SIP Messaging Syntax • Text-based • Similar to HTTP • Disadvantage – more bandwidth consumption • SIP messages • Message = start-line *message-header CRLF [message-body]

  10. SIP for Instant Messaging • The IETF working group – SIP for Instant Messaging and Presence Leveraging Extensions (SIMPLE) • A new SIP method –MESSAGE (RFC 3428) • This request carries the actual message in a message body. • A MESSAGE request does not establish a SIP dialog.

  11. The Session Description Protocol (SDP) • The Most Common Message Body • Be session information describing the media to be exchanged between the parties • SDP, RFC 2327 (initial publication) • SIP uses SDP in an answer/offer mode • An agreement between the two parties as to the types of media they are willing to share • RFC 3264 (An Offer/Answer Model with SDP) • To describe how SDP and SIP should be used together

  12. The Structure of SDP • SDP simply provides a format for describing session information to potential session participants. • Text-based Protocol • The Structure of SDP • Session Level Info • Name of the session • Originator of the session • Time that the session is to be active • Media Level Info • Media type • Port number • Transport protocol • Media format

  13. Mary Proxy server Bob Drawback 1/2

  14. Drawback 2/2

  15. The Message Session Relay Protocol (MSRP) • MSRP is a text-based, connection-oriented protocol for exchanging arbitrary (binary) MIME content, especially instant messages. • The exchange is carried by some signaling protocol, such as the Session Initiation Protocol (SIP). This allows a communication user agent to offer a messaging session as one of the possible media-types in a session. • SIP can use an offer/answer model to transport the MSRP URIs for the media in SDP.

  16. Alice Bob INVITE INVITE sip:bob@biloxi.example.com SIP/2.0 To: <sip:bob@biloxi.example.com> From: <sip:alice@atlanta.example.com>;tag=786 Call-ID: 3413an89KU Content-Type: application/sdp c=IN IP4 atlanta.example.com m=message 7654 TCP/MSRP * a=accept-types:text/plain a=path:msrp://atlanta.example.com:7654/jshA7weztas;tcp 200 OK SIP/2.0 200 OK To: <sip:bob@biloxi.example.com>;tag=087js From: <sip:alice@atlanta.example.com>;tag=786 Call-ID: 3413an89KU Content-Type: application/sdp c=IN IP4 biloxi.example.com m=message 12763 TCP/MSRP * a=accept-types:text/plain a=path:msrp://biloxi.example.com:12763/kjhd37s2s20w2a;tcp ACK MSRP Session

  17. MSRP communication primitives 1/2 • SEND Method • Be used to deliver a complete message or a chunk (a portion of a complete message). src: www.cs.columbia.edu/~hgs/teaching/ais/slides/sip-suthan.ppt

  18. MSRP communication primitives 2/2 • REPORT Method • It report on the status of a previously sent message, or a range of bytes inside a message.

  19. Future Work • Joins the MSRP mechanism in existing SIP phone (Linux – Linphone). • How solves MSRP passes through NAT the question?

  20. Reference • RFC 3261 - SIP: Session Initiation Protocol • http://www.ietf.org/rfc/rfc3261.txt • RFC 3428 - Session Initiation Protocol (SIP) Extension for Instant Messaging • http://www.ietf.org/rfc/rfc3428.txt • RFC 2327 - SDP: Session Description Protocol • http://www.ietf.org/rfc/rfc2327.txt • RFC 3264 - An Offer/Answer Model with the Session Description Protocol (SDP) • http://www.ietf.org/rfc/rfc3264.txt • The Message Session Relay Protocol • http://www.ietf.org/rfc/rfc4975.txt

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