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XCON BOF

XCON BOF. IETF 57 Vienna, Austria July 15, 2003. Administriva. Conscripting a Scribe Note Well announcement (Read Section 10 of RFC 2026) Blue Sheets. Agenda. Welcome and Agenda Bashing (5 min) Problem Statement/Scope Overview (10 min) Charter Discussion (15 min)

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XCON BOF

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  1. XCON BOF IETF 57 Vienna, Austria July 15, 2003

  2. Administriva • Conscripting a Scribe • Note Well announcement (Read Section 10 of RFC 2026) • Blue Sheets

  3. Agenda • Welcome and Agenda Bashing (5 min) • Problem Statement/Scope Overview (10 min) • Charter Discussion (15 min) • Open Discussion (30 min)

  4. Problem Statement/Scope • Defining protocols necessary for participants to control centralized conferences: • Conference Policy Control • Two objects and two sets of operations on: • General policy and membership • Media policy • Floor Control • Motivated by SIP conferencing, but will be independent of call setup protocol. • Protocols developed will not be SIP or SIP extensions

  5. Conference Policy Control • Conference Lifespan • Who can participate (permissions) • What each participant can do (roles) • Notification of conference membership (roster) • Related Documents: • draft-koskelainen-xcon-cpcp-reqs-00.txt • draft-koskelainen-xcon-xcap-cpcp-usage-00.txt • draft-levin-xcon-cpcp-00.txt

  6. Media Policy Control • Defines how media is combined, selected, and modified in a conference • Multiple media types: audio, video, IM, etc. • Result of floor control is an input • Protocol defines how a topology is created, retrieved, and manipulated • Related Documents: • draft-even-xcon-media-policy-requirements-00.txt • draft-mahy-xcon-media-policy-control-00.txt

  7. Floor Control • Floor Definition • Temporary permission for a conference participant to access or manipulate a specific shared resource or group of resources. • Examples include: • Who gets to be heard or be seen by all participants • Who can control a shared whiteboard pointer • Floor Control Protocol Operations • Floor creation (related to media policy) • Floor requesting, granting, and releasing • Related Document: • draft-koskelainen-xcon-floor-control-req-00.txt

  8. Example Use Scenario • User is invited to a conference (dials in) and learns they are in a conference • Subscribes to the conference package and learns the roster and the conference policy URIs • Uses media policy and discovers that the conference is a "lecture" with audio and video and as a result enables video to fully participate in the conference. • Uses conference policy to establish a sidebar (sub-conference) with another participant • Uses floor control to request the floor to ask a question • draft-even-xcon-conference-scenarios-00.txt

  9. Example Topology: Central Control and Mixing Focus Out Of Scope Media Mixer Media Call Control

  10. Example Topology: Central Control, Full-Mesh Media Focus Media Call Control

  11. Example Topology: Cascaded Conferences User 1 User 4 Conference A Conference B Focus Focus User 2 Media Mixer Media Mixer User 3 Media Call Control

  12. Relation to Other WGs • SIPPING • MMUSIC • AVT • SIP • W3C SMIL

  13. Charter (1/4): Deliverables • A mechanism for membership and authorization control • A mechanism to manipulate and describe media "layout" or "topology" for multiple media types • A mechanism for notification of conference related events/changes (policy/floor events) • A basic floor control protocol

  14. Charter (2/4): NON-Deliverables • Voting • Multicast media (due to security concerns) • Fully distributed conferences • Loosely-coupled conferences (no central point of control) • Far-end device control • Protocol used between the conference controller and the mixer(s) • Capabilities negotiation of the mixer(s) • Master-slave cascaded conferences

  15. Charter (3/4): External Inputs • draft-ietf-sipping-conferencing-requirements-00.txt • draft-ietf-sipping-conferencing-framework-00.txt • draft-ietf-sipping-cc-conferencing-01.txt • draft-ietf-sipping-cc-framework-02.txt • draft-ietf-sipping-conference-package-01.txt(get copy from http://ee.wustl.edu/~alan/sip-conf/)

  16. Charter (4/4): Proposed Items • draft-even-xcon-conference-scenarios-00.txt • draft-koskelainen-xcon-cpcp-reqs-00.txt • draft-even-xcon-media-policy-requirements-00.txt • draft-koskelainen-xcon-floor-control-req-00.txt • draft-koskelainen-xcon-xcap-cpcp-usage-00.txt • draft-levin-xcon-cpcp-00.txt • draft-mahy-xcon-media-policy-control-00.txt

  17. Next Steps/Issues • Consensus/Approval for Charter • Finalize Conference Policy Requirements • Decide on protocol • XCAP/SOAP/XML-RPC • Continue work on Media Policy • Create policy notification packages • Define interface between Media Policy and Floor Control

  18. Open Discussion

  19. Further Info Mailing List: http://www.softarmor.com/mailman/listinfo/xcon SUBSCRIBE to xcon-request@softarmor.com BOF Chairs: Alan Johnston (alan.johnston@mci.com) Adam Roach (adam@dynamicsoft.com)

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