XCON Framework Overview & Issues Editors: Mary Barnes Chris Boulton Orit Levin XCON WG IETF-63 Meeting Paris, August 1st 2005

1 draft-ietf-xcon-framework-01 Aug 1 st, 2005 Overview  Updates since IETF-62  Summary of Open Issues  Additional Work items  Overview of CCP proposals  Way Forward

2 draft-ietf-xcon-framework-01 Aug 1 st, 2005 Updates (-00)  Changes based on mailing list and IETF-62 discussions:  Editorial changes.  Added a new section to discuss Identifiers.  Add “Floor Information” as part of Common Conference Information and added “Floor Control” to Conference Template.  Added subsections discussing CSCP and Netconf as potential conference control protocols.  Added additional examples in section 7, including sidebars.

3 draft-ietf-xcon-framework-01 Aug 1 st, 2005 Updates (-00)  DP1: Referring to Sets of Meetings – text updated to reflect consensus:  F unctionality is inherently supportable with “cloning tree“ structure and iCal (and should not impact current/planned iCal functionality).  Specifies that there is a single “time” from which other times are derived (subject to system considerations).

4 draft-ietf-xcon-framework-01 Aug 1 st, 2005 Updates (-00)  DP3: Querying templates – text updated to reflect consensus:  Need the ability to query a server about a particular template to retrieve a description, with 2 options:  XML Schema - as in current templates draft. This then supplies all relevant information that a client needs.  “Blueprint”, per current FW, which includes a template instantiation with customized values  Description is the same as the XML schema that is registered with IANA.  XCON server “advertises” what it supports to the client; Client retrieves the template from the server itself (and NOT from some centralized repository)  A client would need to query any templates that it doesn't understand THEN make a decision on compatibility.  Interface hints need to be included (e.g. per current template draft).

5 draft-ietf-xcon-framework-01 Aug 1 st, 2005 Updates (-01)  Primary changes involved refining and clarifying the terminology and editorial changes to improve readability and precision.  Terminology changes:  Slight modifications (simplifications) to Call (control) signalling, Conference Identifer, Conference Instance, Conference Object.  Renaming of term "Registered Template Definition" to "Registered Conference Document" (per agreement at interim meeting).  Clarified text in section 3 such that it doesn’t read as if the focus perform media mixing.  Re-arranged subsections of Identifier section, adding a Conference Object subsection with a diagram to clarify relationship amongst identifers.  Scheduling future conferences: added discussion of the concept of an infinite series.  Sidebar example: added more explicit references to XCON FW constructs.

6 draft-ietf-xcon-framework-01 Aug 1 st, 2005 Updates (-01)  Introduced SOAP as an option for the Conference Control Protocol.

7 draft-ietf-xcon-framework-01 Aug 1 st, 2005 Issue – DP4  DP4: XML Schema Structure – 3 options proposed: 1. Option 1: Template at the top level, with Common Conference Information as a subsection. 2. Option 2: Common Conference Information at top 3. Option 3: Template and Common Conference Information are conveyed as two separate objects  Proposal: Need to work details of CCP proposal(s) to determine optimum approach.

8 draft-ietf-xcon-framework-01 Aug 1 st, 2005  DP5: State and Policy Manipulation Protocol(s)  Past mailing list discussion converged to the point that the differentiation between syntactic and semantic is artificial and doesn’t resolve anything.  Proposal put forth that “ semantic model” can also support fundamental syntactic model (for data manipulations).  Four protocols on the table: CPCP, CSCP, CCCP, NetConf  Proposal to use two protocols (CPCP/CSCP or Netconf/CCCP) is not particularly constructive (albeit not impossible).  SOAP put forth as new (5 th ) protocol proposal. Issue – DP5

9 draft-ietf-xcon-framework-01 Aug 1 st, 2005 Issues – Identified on mailing list for -01  Conference policies: not explicitly addressed.  Current text is consistent with WG agreement (at interim and discussed on list) that there is no separation of “policy” from the conference data itself ; it’s all part of the “Conference Object”.  Policy uses ranges to control limits on values  Policy is based on simple list structures (i.e. a list (of clients) per type of data the listed clients have permission to manipulate).  As mentioned in document, if there is a need in the future (non is foreseen for currently envisioned functionality), the specification of such is FFS within XCON.  Proposal: ensure text is consistent and clear. (Note: there is an open issue to add the details of how this policy model is realized within the XCON FW. Perhaps this detail should be in the examples in section 7.)

10 draft-ietf-xcon-framework-01 Aug 1 st, 2005 Issues – Identified on mailing list for -01  Templates vs. Blueprints: appears to be inconsistent distinction between the two within the document. The following had been agreed previously:  Template is associated with a human-readable doc (eg. RFC), with an IANA registry based on a triplet of form: name, RFC, XML schema.  Client can query a conferencing system for a list of templates that the system supports (per discussion of “Blueprints”).  Note: Blueprint is a data object, Template is a “type”  Proposal: remove the parenthetical reference to templates in section 6.3. (Note: paragraph 3 of that section is also using “template” rather than “blueprint”).

11 draft-ietf-xcon-framework-01 Aug 1 st, 2005 Issues – Identified on mailing list for -01  SIPPING vs. XCON Framework. Proposal that major differences SHOULD be resolved.  Key issue is compatibility of sipping-cc-conferencing and sipping- conference-package with XCON model.  Messaging should not change, although model/implementation would change to support additional, new XCON defined functionality.  Proposal: re-review and evaluate specific concerns.

12 draft-ietf-xcon-framework-01 Aug 1 st, 2005 Additional work to complete  6.4: Floor control section:  Current text intended to align terminology/identifiers from BFCP with XCON FW identifiers.  Less detail (security in particular) required.  Complete detail in section 7:  Include functionality such private messages, etc.  Add additional scenarios/flows to highlight how the XCON functional elements work together and more importantly how a UA interfaces to the elements to achieve the desired functionality.

13 draft-ietf-xcon-framework-01 Aug 1 st, 2005 New work identified by Framework  The following items are identified as requiring further specification, in other documents, based upon the current discussion and concepts introduced in the framework:  URI schema(s) for new identifiers.  Mechanism/details for Data Access Rights and Conference Control Limits and Permissions (i.e. “conference policies”).  Alternative proposal for Floor control based on templates (based on past WG discussions)?

14 draft-ietf-xcon-framework-01 Aug 1 st, 2005 DP5: CCP Protocol – Overview of options Protocol Attribute CPCPCSCPCCCPNetconfSOAP Based on XML Yes.No (binary, but could use a converted XML schema) Yes. No (WSDL – could be derived from XML) Existing Protocol Yes (XCAP) Yes (extends BFCP) No.Yes. Event notification mechanism Yes No (use SIP mechanism) No.No (use SIP mechanism) Compact/ Efficient NoYesNo Easy to Implement NoYes

15 draft-ietf-xcon-framework-01 Aug 1 st, 2005 Way Forward  Need additional mailing list feedback.

16 draft-ietf-xcon-framework-01 Aug 1 st, 2005 Back-up  Conferencing System Model diagram  Conference Object Type diagram  Cloning Tree for System Realization

17 draft-ietf-xcon-framework-01 Aug 1 st, 2005 Conferencing System Decomposition Conferencing System Floor Control Client Notification Service Conference Control Client Conference Control Server Call Signaling Client Notification Client Floor Control Server SIP/ PSTN/ H.323 T.120/ Etc. TBD SIP NOTIFY/ Etc. Conferencing Client Foci Conference Object No Changes BFCP Data I/F XCON Other

18 draft-ietf-xcon-framework-01 Aug 1 st, 2005 Conference Object Type User Control Interface Mixer Algorithm Inputs And Outputs User’s View Etc. Conference Template Type Conference Description Membership (Roles, Capacity, Names) Signaling (Protocol, Direction, Status) Sidebars (and other attributes) Common Conference Information Type

19 draft-ietf-xcon-framework-01 Aug 1 st, 2005 Cloning Tree for System Realization Parent A Conference Object PoliciesPolicies Parent B Conference Object PoliciesPolicies (Created as “Independent from Parent) Child 1 Conference Object PoliciesPolicies Child 2 Conference Object PoliciesPolicies