as reported by Dean Willis
Agenda accepted as proposed.
Charter discussion -- under review from IETF, further discussion postponed.
Robert Sparks discussed call transfer and related dependencies. No issues raised.
Requirements for hearing-impaired users -- Arnoud van Wijk
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Reqs: 1) Automatic use of relay services 2) Transparent to end user 3) Caller ID visible 4) Support for current and legacy relay devices 5) Add/remove media streams at any point 6) one-to-many streams, efficiently (multicast or broadcast?) -- discussion on this point. Request feedback on technical means from audience.
Bottom line: hearing impaired people should be a able to communicate using ordinary phones using IM, chat, video, etc.
Work plan: Finish requirements draft by Dec01. Move example flows to later in document
Question: Do we need to consider the global text telephony efforts from 3G? Response -- maybe, let's focus on requirements for now. Comment -- really critical to consider requirements. For example, text in one way and voice in the other could be useful. Further discussion -- this probably needs to be a topic of coordination with 3GPP SA1. Further -- bidirectional streams with mixed attributes may already be solved by FID in MMUSIC, but this approach may be explicitly blocked by assumptions in 3GPP. From 3GPP Liason: There are explicit requirements to support hearing impaired users in 3GPP, especially for emergency services. It would be useful to have a commonality of requirements between the two orgs. Reminder to consider that the current solutions are extremely resource restricted.
Call Control Modeling -- Rohan Mahy
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Terminology -- definition of call, conversation space, and participants as user-oriented terms. This relates to several defs from 2543 -- call, call leg, conference, and session. Debate on whether changing of media qualifies as a change of content and thereby makes the changing element a "participant" of the call. Examples given using a visual set representation (see slides) and an algebra of conversation space manipulations. Work planning briefly discussed, but due to dependency on charter (currently undefined) left for later.
Event Package for Calls -- Jonathan Rosenberg
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Several components; events package, new headers (To-Join and To-Replace) to carry SIP URLS for use in joining or replacing existing call, usage of those URLs. This seems to resolve some open issues with consultation transfers. Debate on advantages of extensions vs. not adding them. Some debate on headers vs. parameters and interaction with REPLACES. Extended and very confused conversation on semantics of set operations in conversation spaces. Some discussion of whether this sort of work belongs in SIP or SIPPING and how it should be planned. No conclusion.
Conventions for Accessing Media Server Resources -- Eric Burger
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Proposes encoding convention for LHS of SIP URI. Intense discussion with no clear consensus resulted during the initial presentation. Primary concerns raised by RFC3087 proponents include likelihood of bad assumptions about function being made by users.
3GPP Architecture -- Keith Drage
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Review of operating assumptions from 3GPP. Consensus in the room that SIPPING group has enough background on 3GPP to start considering concrete requirements without further review.
QoS and Why it Matters to SIP -- Johnson Oyama
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Discuss absolute dependency of IMS architecture on QoS mechanism as policy enforcement for billing model.
Security and Authentication -- Peter Howard
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Concerns raised with 3GPP authentication policy of validing REGISTER and not
INVITE. This appears to run a misattribution risk as client software cannot be
considered "trusted" to not alter presented user identity.
The Cx Interface -- Johanna Wild
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Minimal discussion.
Dependencies on SIP and SIPPING Drafts -- Ileana Leuca
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Minimal discussion.
Network Announcements -- Eric Burger
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Debate centered on RFC 3087 issues and advisability of making "parseable"
service names.
updated 13 Dec 2001 13:13:52 -0600