1 / 18

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

lumina
Download Presentation

IETF Working Group

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related