Minutes SIPPING WG at IETF 62 Minutes edited by Gonzalo Camarillo Based on notes by Spencer Dawkins and Azita Kia Meeting chaired by Dean Willis, Rohan Mahy, and Gonzalo Camarillo THURSDAY, March 10, 2005, 0900-1130 Topic: Agenda Bash by chairs The "Semi Regular Examples", "Multiple Dialog Usages in SIP" and "Example call flows using SIP security mechanisms" individual I-Ds were brought to the attention of the WG. The authors requested comments on them. Gonzalo Camarillo and Robert Sparks will coordinate the review of the Torture Tests I-D by a set of volunteers. The idea is to have the I-D fully reviewed before the next SIPit. The WGLC on the URI-list services I-Ds has ended, but given that these I-Ds depend on the consent work, their publication will be requested together with the consent I-Ds when these are ready. It was noted that the current charter and milestones are completely obsolete, despite having had changes submitted several times by the chairs and the ADs. Apparently there is some sort of process problem with the IETF web site. The chairs encouraged people to put work more between IETF meetings, and not only right before the meetings. The Location Requirements I-D has been moved to SIP. Topic: Configuration Framework Presentation led by: Dan Petrie Relevant document: draft-ietf-sipping-config-framework-06.txt The changes introduced in the latest revision of the document were presented. The XCAP section of the draft needs to be improved. There was agreement to restrict the transports supported by the framework to only HTTP/HTTPS. The author noted that this draft is close to be ready, and requested people to read it and send comments now that it is still possible to include them. Topic: Data Sets Presentation led by: Dan Petrie Relevant document: draft-petrie-sipping-profile-datasets-01.txt At this point of the meeting, it was noted that there are not enough people reading the I-Ds in the agenda. It was also noted that it is not realistic that people read all the drafts in the agendas of SIP, SIPPING, SIMPLE, XCON, and MMUSIC. It is clear that it is necessary to finish a few chartered items before trying to tackle new work. The changes made for the last revision of the I-D were presented. It was noted that having elements that can be registered in other contexts as text strings would cause problems. The XML schema should be designed with those registries in mind. More discussions needed on which elements to include in the schema. In general, elements that are not going to be used by anyone should not be included. Topic: Session Policies Discussions led by: Volker Hilt Relevant documents: draft-ietf-sipping-session-indep-policy-02.txt draft-hilt-sipping-session-spec-policy-02.txt Discussions on which policy protocol to use. Agreement that the two options that implementors are more likely to actually implement are SUBS/NOT for user agents to obtain policies and PUBLISH, HTTP, or SUBSCRIBE to send session information to the policy server. However, clearer use cases are needed before a decision can be made. Topic: Consent Discussions led by: Gonzalo Camarillo Relevant documents: draft-ietf-sipping-consent-reqs-00.txt draft-ietf-sipping-consent-framework-01.txt The WG did not have a strong opinion on how to identify translations on relays (using the Request-URI or a header). It was also suggested to explore using a URI parameter. There were discussions on the mandatory protocol to be used to upload permission documents: SUBS/NOTIFY plus PUBLISH vs. XCAP. It was claimed that if a SIP-based mechanism is chosen, SIP-only devices will be able to use this framework. However, XCAP supports more complex composition policies. There was no consensus in the room. Further discussions to take place on the mailing list. Topic: Transcoding Discussions led by: Gonzalo Camarillo Relevant documents: draft-ietf-sipping-transc-framework-01.txt Conferencing model vs. using Route entries. Total consensus in the room that the conferencing model should be used. The author will edit the framework accordingly and release an updated I-D defining the conference model (the current I-D has expired). Topic: IPv6 Transition in SIP Discussions led by: Gonzalo Camarillo Relevant documents: draft-camarillo-sipping-v6-transition-00.txt The IESG is requesting SIPPING to do this. Total consensus to adopt this I-D as a WG item. Topic: Session Border Controllers Discussions led by: Jani Hautakorpi Relevant documents: draft-camarillo-sipping-sbc-funcs-00.txt draft-bhatia-sipping-sbc-00.txt Both I-Ds will be merged. The resulting I-D's scope will be to document functions that existing SBCs implement and that break SIP somehow. This work will be used as input by different WGs to decide whether or not new specifications or recommendations are needed in this area. FRIDAY, March 11, 2005, 0900-1130 Topic: Agenda Bash by chairs No comments from the floor. Topic: Conferencing Package Discussions led by: Orit Levin Relevant document: draft-ietf-sipping-conference-package-09.txt Still open issues. The author will discuss them with the folks that sent the WGLC comments to the mailing list and release a new version addressing them. Topic: Redirection Reason Discussions led by: John Elwell Relevant document: draft-elwell-sipping-redirection-reason-01.txt Not clear what the 302 ambiguity problem the draft attempts to resolve is. Needs to be clarified. Does it have something to do with request history? Is it only applicable to legacy (e.g., PSTN interworking) or to new applications? Topic: Multipart bodies Discussions led by: Cullen Jennings Relevant document: draft-jennings-sipping-multipart-00.txt We need to have a clear scope for the draft. That is, we do not want to have two ways to do things that are currently addressed by the SDP grouping framework (e.g., ANAT). Topic: Status Update HashCash & Pay Discussions led by: Cullen Jennings Relevant documents: draft-jennings-sipping-pay-01.txt draft-jennings-sip-hashcash-01.txt Discussions on which of the approaches (pay or hashcash) addresses better the SPAM problem. Further discussions will take place in the mailing list. Topic: Event Thorttles Discussions led by: Aki Niemi Relevant document: draft-niemi-sipping-event-throttle-02.txt This seems to be useful for data that changes rapidly and gives the subscriber overrides. However, a document may contain several types of data, and the notifications of some of these may not need to be throttled. A filter may do the job in a better way (e.g., if his availability to receive voice calls changes, notify me at once, but if his GPS position changes, notify me only once every 10 seconds). The chairs will poll the list for consensus. Topic: LESS: Language for End System Services in Internet Telephony Discussions led by: Henning Schulzrinne Relevant document: draft-wu-iptel-less-00.txt The author gave a heads up for the community. Allison said that other communities are saying that since there is so many SIP specification, they are building their own SIP monolith. She would discourage informational publications at this point. Topic: Session Mobility Discussions led by: Henning Schulzrinne Relevant document: draft-shacham-sipping-session-mobility-00.txt The author gave a heads up for the community.