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IETF Working Group

IETF Working Group. CSCI 344 Spring 1998. Presentation. Nathan Mittler Multiparty Multimedia Session Control (mmusic). General Description (Cont.). URL: http://www.ietf.org/ html.charters/mmusic-charter.html How to get on mailing list: General discussion: confctrl@isi.edu

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IETF Working Group

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  1. IETF Working Group CSCI 344 Spring 1998 Presentation Nathan Mittler Multiparty Multimedia Session Control (mmusic) IETF WG Presentation

  2. General Description (Cont.) • URL: • http://www.ietf.org/ html.charters/mmusic-charter.html • How to get on mailing list: • General discussion: confctrl@isi.edu • To subscribe: confctrl-request@isi.edu IETF WG Presentation

  3. General Description • Chartered to develop Internet standards track protocols to support Internet teleconferencing IETF WG Presentation

  4. General Description (Cont.) • has drafted protocols for: • distributing session description (SDP) • providing security for session announcements (SAP Security) • controlling on-demand delivery of real-time data (RTSP) • initializing sessions and inviting users(SIP) • managing tightly-controlled sessions (SCCP) IETF WG Presentation

  5. General Description (Cont.) • Additional documents (informal) • architectural framework for MMUSIC • interoperability scenarios for Internet-based teleconferencing systems IETF WG Presentation

  6. General Description (Cont.) • Intermediate goals: • bring several protocols to Proposed Standard (SDP,RTSP) or Experimental RFC status • to produce Informational RFCs for all informational drafts IETF WG Presentation

  7. General Description (Cont.) • Long-term goals: • bring remaining protocols to Proposed standard status • to investigate the requirements for a next-generation session description protocol IETF WG Presentation

  8. Internet Draft 1:Real-Time Streaming Protocol (RTSP) • Application-level protocol • controls either a single or several time-synchronized streams of continuous media • Continuous media: • Data where there is a timing relationship between source and sink • the sink must reproduce the timing relationship that existed at the source. IETF WG Presentation

  9. Internet Draft 1:Real-Time Streaming Protocol (RTSP) (Cont.) • Protocol supports the following operations: • Retrieval of media from media server: • Client can request a presentation description • If presentation is being multicast the presentation description contains the multicast addresses and ports to be used for the continuous media • If presentation is to be sent only to the client via unicast, the client provides the destination for security reasons IETF WG Presentation

  10. Internet Draft 1:Real-Time Streaming Protocol (RTSP) (Cont.) • Invitation of a media server to a conference: • A media server can be “invited” to join an existing conference • to play back media into a presentation • to record all or a subset of the media in a presentation • is useful for distributed teaching applications IETF WG Presentation

  11. Internet Draft 2:Internet Multimedia Conferencing Architecture • Determining factors of a conferencing architecture are: • communication (possibly large) groups of humans • real-time delivery of information IETF WG Presentation

  12. Internet Draft 2:Conferencing Architecture (Cont.) • Early conferencing systems used a fan-out of data streams • 1 connection between each pair of participants • same info must cross some networks more than once IETF WG Presentation

  13. Internet Draft 2:Conferencing Architecture (Cont.) • Internet architecture uses more efficient approach of multicasting info to all participants IETF WG Presentation

  14. Internet Draft 2:Conferencing Architecture (Cont.) • IP multicast service model: • Senders send datagrams to the address of a multicast group • Receivers express an interest in (join) certain multicast groups • Multicast routers conspire to deliver multicast group addressed datagrams from the senders to receivers IETF WG Presentation

  15. Internet Draft 2:Conferencing Architecture (Cont.) • Separate Flows for each Media Stream • no need for the different media comprising a conference to be carried in same packets • simplifies receivers • allows the different media to be given different quality of service • ie) under congestion, a router might preferentially drop video packets over audio packets IETF WG Presentation

  16. Internet Draft 2:Conferencing Architecture (Cont.) • Synchronisation • audio and video that were grabbed at same time may not arrive at same time • at the receiver, each flow will need a playout buffer to remove network jitter • Synchronisation is performed by adapting playout buffers so that samples/frames that originated at same time get played at same time IETF WG Presentation

  17. 41st IETF Meeting in Los Angeles Dates of 41st meeting Sunday March 29, 1998 - Friday April 3rd, 1998 Meetings - Tuesday, March 31 at 1:00 p.m. - 3:15 p.m. Session Initiation Protocol (SIP) Session Announcement Protocol (SAP) Security SIP call control IETF WG Presentation

  18. 42nd IETF Meeting • Meeting August 23-28 1998 in Chicago. IETF WG Presentation

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