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SIP Conferencing Requirements

SIP Conferencing Requirements. Henning Schulzrinne Petri Koskelainen Columbia University. General philosophy. SIP philosophy: strictly separate media and session signaling thus, media control (e.g., retransmission requests) out of scope thus, encoding profiles out of scope

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SIP Conferencing Requirements

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  1. SIP Conferencing Requirements Henning Schulzrinne Petri Koskelainen Columbia University SIP/SIPPING Interim Meeting

  2. General philosophy • SIP philosophy: strictly separate media and session signaling • thus, media control (e.g., retransmission requests) out of scope • thus, encoding profiles out of scope • orthogonal  apply also to other conference types • Support central-controller conferences: • central mixing or selection/replication or end-system mix • possibly different addresses for different media sessions • media session(s) identified by single SIP URI • SSM: sources send to controller = root of multicast tree • Allow re-use of SIMPLE approaches • subscription permission  conference join permission • buddy list  pre-stored participant list SIP/SIPPING Interim Meeting

  3. Don't invent new pieces (unless we have to) • Tease out conferencing-specific needs • modular, no H.323-like vertical stack • avoid conferencing-specific profiles • no T.120 special case (except through gateways) • No need to define requirements for things that we already have: • conference creation (but may need termination) • conference joining and leaving • participant muting • renegotiation of leg codecs SIP/SIPPING Interim Meeting

  4. No meta application • Believe that meta-app model is misguided  seems to call for another signaling protocol, identifier, etc. • if no protocol or identifier, invisible • don't want uninstantiated relationships • we can set up sessions (including T.120...) via SIP SIP/SIPPING Interim Meeting

  5. General model • Divide into requests and notifications • requests = do something • notification = something happened • Requests may trigger notifications if action may be delayed or partial • human approval • group invite SIP/SIPPING Interim Meeting

  6. Motherhood and Apple Pie • Simplicity • bandwidth-frugal (mobile) • incremental notifications and command • selectable notification granularity • templates for privileges SIP/SIPPING Interim Meeting

  7. Components • Identified by object manipulated: • conferences  conference management • participants within conferences  user management • shared resource  floor control SIP/SIPPING Interim Meeting

  8. Conference management • Create conference [?] • Delete conference • name vs. resources • Conference properties: • description (subject) • visibility to searching and directories • policies? SIP/SIPPING Interim Meeting

  9. User management • Cause server to invite user(s) • Expel users • List of pre-approved attendees • User rights • invite, expel, approve others • manage & request floor • add media sessions • Join notification • with thresholding • Obtain list of members SIP/SIPPING Interim Meeting

  10. Open issues • Separate conference name existence from resource allocation • want to keep name, but not mixing and bandwidth resources • Template management: • user lists • privilege levels ("chair", "secretary", "panelist", "audience") SIP/SIPPING Interim Meeting

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