[Sip] Draft SIP minutes for IETF 74 posted
Dean Willis <dean.willis@softarmor.com> Wed, 15 April 2009 04:35 UTC
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Subject: [Sip] Draft SIP minutes for IETF 74 posted
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See: http://www.softarmor.com/mediawiki/index.php/Minutes_for_SIP_at_IETF_74 A text-paste follows (original has HTML markup for clarity). ------------------------ Minutes for SIP at IETTF 74Session 1, SIPCORE-like topicsAgenda BashLed by Chairs Slides presented and included in minutes Agenda accepted as presented. SIP Forum configuration profile work mentioned, interested people invited to Wednesday breakfast. Current status of WG documents reviewed. Topic: SIP Change Process IntroLed by: Jon Peterson draft-peterson-rai-rfc3427bis-01 Slides presented and included in minutes Reviewed IETF LC status of RFC32427bis and invited comments at IETF level. Issue: SIPCORE scope Spencer Dawkins suggested that the charter text should include discussion about ADs being able to make judgement calls on SIPCORE charter items as needed. Issue: DISPATCH scope Discussion centered on defining the deliverables of SIPCORE and the need to get small things done somewhere. Issue: Deliverables of DISPATCH Agreed that DISPATCH will deliver neither Proposed Standards nor protocol specifications. Deliverables might include problem statements, draft charters, or work plans for non-WG BOFs such as was used for the media security requirements work. DISPATCH will not work like TSVWG, and will not act as a "product manager" serving requirements to the SIPCORE "engineers", but may direct work items towards working groups without placing any requirement on that WG to actually do the work. Issue: Where to do small work items It is envisioned that mall work items can be done in BOF-like formats or through individual efforts, and pushed through as AD-sponsored non- WG drafts. Issue: Time required to launch a new WG We do not expect a mechanism whereby requirements can be brought into a DISPATCH meeting and result in a new WG formed at the next IETF meeting. Rather, the traditional BOF process is anticipated to apply. Issue: P-headers and Existing Work In Progress Several in-process drafts define p-headers. This will proceed without change. Further new work will NOT define p-headers; rather each header will be tagged as to its status in the registry. Topic: Early Dialog terminationLed by: Christer Holmberg draft-ietf-sip-199-02 Slides presented and included in minutes Some discussion occurred on reliable transmission and B2BUA interactions. There was apparently a long on-list discussion that resulted in the current text. ISsue: Are we ready for WGLC? Chair noted that previous WGLC resulted in many new issues, and that he would like to see closure on those issues before renewing the last call. Chair is to make a new call on-list, and if there are no reports of remaining open issues, the chair will issue a new WGLC. Topic: 3261 Interop StatementLed by: Robert Sparks draft-sparks-sip-3261-interop-statement-00 No slides presented. Proposed that the reference document will be placed on-line and maintained as a living document. Also proposed that the interop statement document can be used to build an evaluation tool for use at SIPit. No objections to this approach were noted. Topic: 3261 Normative ReferencesLed by: Robert Sparks draft-sparks-sip-3261-norm-ref-status-00 No slides presented. Status of work was presented, with no discussion or issues noted from attendees. Topic: Fix INVITE transactionLed by: Robert Sparks draft-sparks-sip-invfix-03 Slides presented and included in minutes Theo Zourzouvillys will be acting as editor for this document. Issue: Does the increase in state size (for accepted) break things? Robert noted that much of draft was driven by working implementations at SIPit, so this is not expected to be a major issue. However, it should be noted that this approach does significantly increase the amount of transaction state kept in proxies. Topic: RFC 4244bisLed by: Francois Audet draft-barnes-sip-rfc4244bis-00 draft-rosenberg-sip-target-uri-delivery-00 Slides presented and included in minutes Initial discussion reviewed the changes to the document, and discussed whether resolving the security concerns of RFC 4244 are in-scope. Issue: Naming semantics We have a number of names like retargeting, rerouting, etc. in use. Agreed that we need to have a more precise and semantically appropriate terminology for tagging. Issue: Marking History-Info Entries An extended discussion developed on what H-I is used for, what the scope of our chartered work here is, and so on. It was noted that our scope here is to address the requirement to deliver the initial request-URI target to the UAS, which is required in 800-number translation (free-dial) services. (editors note: This is only true is the PSTN model is maintained; when not doing PSTN interworking, there are many other ways to approach such alias operations, including per- alias GRUU minting.) Issue: Progress 4244bis, target-uri draft, or both? In the absence of a clear consensus, the chairs proposed that both documents proceed and we'll hope that further discussion gives us a consensus. Topic: Info EventsLed by: Eric Burger draft-ietf-sip-info-events-03 Slides presented and included in minutes Issue: 489 Noted that while we agree that the content of the INFO itself does not directly change the state of the SIP machine, that protocol operations at the SIP level (such as cseq numbers and failure conditions) certainly do change the SIP state machine's state. Issue: Where to allow/disallow Recv-info processing? We agree that processing Recv-Info in 100 messages doesn't make a lot of sense. We do not seem to have a use case for Recv-Info in PRACK/ PRACK-2xx or REFER, but currently see no real reason to forbid its use there. Chair polled room for WGLC-readiness, and it seems that most people believe the draft is essentially ready. Session 2, DISPATCH-like topicsTopic: SIP VIa CookiesLed by: Theo Zourzouvillys draft-zourzouvillys-sip-via-cookie-02 Slides presented and included in minutes Discussion showed a strong interest in the work, and a general consensus that switching to TCP is not an acceptable solution to the problems raised. Further discussion on approach and attack- prioritization is to be deferred to the list. Topic: Keepalive Without OutboundLed by: Christer Holmberg draft-holmberg-sip-keep-03 Slides presented and included in minutes Presentation focused on use cases and requirements. It is not clear from the presentation whether there have been requirements changes since the preceding version. The author expects to submit a revised draft that will address all the use cases, so further discussion os deferred to the list after posting of the revised draft. Topic: Secure Call IDLed by: Hadriel Kaplan draft-kaplan-sip-secure-call-id-00 Slides presented and included in minutes A great deal of discussion ensued, with very little in the way of recognizable notes, or for that matter, recognizable progress, being made. Having a recognizer in the call identifier It was proposed that the "new safe identifier" have some sort of recognizer token, so that SBCs could easily decide not to change it. This proposal was rejected, on the grounds that some UAs today send "safe" call-ids that do not need to be changed, but that do not contain the proposed recognizer token. Issue: Changing the ABNF Noted that changing the ABNF is not nadvisable, as this might cause some picky nodes to reject legacy messages. This guidance may be better constructed as a "best practice." Further discussion deferred to list. Topic: Session IDLed by: Hadriel Kaplan draft-kaplan-sip-session-id-01 Slides presented and included in minutes Extended discussion focused on the use case and relationship to Call- ID. Further discussion centered on whether SBCs can be presumed to leave anything lone -- after all, many strip unknown headers already. Further discussion was deferred to the list. Topic: User to User for ISDNLed by: Alan Johnston draft-johnston-sipping-cc-uui-07 Slides presented and included in minutes Issue: Do we need INFO-style meta-information Alan argues that no negotiation on data types is needed if this is requested to only ISDN-style user-to-user data. However, many participants seemed to believe that if the header is there, somebody will use it for something new, and we'll be back to where we were with non-negotiated INFO usages and having to guess about whether the other party understands the payload. Issue: Header vs. body? Proposed mechanism is to put the data in a SIP header, whereas our traditional approach to these sorts of things is to use a MIME body. There seemed to be a lack of consensus about this approach in the room. Topic: Batch NOTIFYsLed by: Alan Johnston draft-johnston-sipping-batch-notify-00 Slides presented and included in minutes The room seems to have a consensus that more discussion at the requirements level is needed before we get into mechanism. Topic: Context-ID RequirementsLed by: Salvatore Loreto draft-loreto-sipping-context-id-requirements Slides presented and included in minutes Noted that this may be the tip of the iceberg for a larger body of disaggregated media work that we may need to address, and this raises many interesting questions. Further discussion is needed on-list. Topic: Changes to Referred-ByLed by: Salvatore Loreto draft-loreto-sipping-3892bis-01 Slides presented and included in minutes Issue: Including multiple P-Asserted-Identity values in Referred-By Noted that we need to understand what a receiver does with multiple identity expressions. Also noted that if multiple identities make sense for P-Asserted-Identity, they may make sense for Referred-By. No conclusion noted. Topic: Updates to the Updates to Asserted Identity in SIPLed by: Hadriel Kaplan draft-kaplan-sipping-pai-responses-00 Slides presented and included in minutes Noted by chair Dean That the current model "no identity in responses" was driven by security review on the initial work, and that changing to allow use in responses requires overcoming the objections raised at that time, which primarily relate to authentication of responses. Discussion revealed that there may be use cases, specifically around draft-ietf-sip-outbound, where separate authentication of responses may not be required, and that this mechanism was not available at the time RFC 3325 was developed. Further discussion was deferred to the list. Topic: Digest Relay AttackLed by: Raphael Coeffic draft-state-sip-relay-attack-00 Slides presented and included in minutes Initial discussion focused on the threat model in the draft and how this relates to message authentication. Authors noted that Section 4 is weak and they may wish to remove it. Chair noted that the question should be "Are these attacks important enough to describe them in BCP, and determine if we have interest in addressing them." Meeting concluded
- [Sip] Draft SIP minutes for IETF 74 posted Dean Willis