Re: Internal WG Review: Recharter of Multiparty Multimedia Session Control (mmusic)

["James Kempf" <kempf@docomolabs-usa.com>]

This charter looks generally good, but the schedule seems extremely
aggressive to me. I'm not familiar with this working group, but unless
there are lots of very motiviated people, very little controversy, and
most of the work is well underway, it seems a stretch. Do the chairs
believe the schedule is realistic?


            jak


----- Original Message -----
From: "The IETF Secretariat" <ietf-secretariat@ietf.org>
To: <iesg@ietf.org>; <iab@ietf.org>
Cc: <jo@ipdialog.com>; <csp@csperkins.org>
Sent: Tuesday, May 06, 2003 11:21 AM
Subject: Internal WG Review: Recharter of Multiparty Multimedia
Session Control (mmusic)


> A new charter for Multiparty Multimedia Session Control WG (mmusic)
in
> the Transport Area is being considered. The draft charter is
provided below
> for your review and comments.
>
> Review Time is ONE week.
>
> The Secretariat.
>
>
>
> Multiparty Multimedia Session Control (mmusic)
> -------------------------------------
>
> Chair(s):
>
> Joerg Ott <jo@ipdialog.com>
> Colin Perkins <csp@csperkins.org>
>
> Transport Area Director(s):
>
> Jon Peterson <jon.peterson@neustar.biz>
> Allison Mankin <mankin@psg.com>
>
> Transport Area Advisor:
>
> Jon Peterson <jon.peterson@neustar.biz>
>
> Mailing Lists:
>
> General Discussion: mmusic@ietf.org
> To Subscribe: mmusic-request@ietf.org
> In Body: subscribe your_email_address
> Archive: http://www.ietf.org/mailman/listinfo/mmusic
>
> Description of Working Group:
>
> The Multiparty MUltimedia SessIon Control (MMUSIC) Working Group
(WG) was
> chartered to develop protocols to support Internet teleconferencing
and
> multimedia communications. These protocols are now reasonably
mature, and
> many have received widespread deployment. The group is now focussed
on the
> revisions of these protocols in the light of implementation
experience and
> additional demands that have arisen from other WGs (such as AVT,
SIP,
> SIPPING, and MEGACO).
>
> Multimedia communications protocols use a common platform for
expressing
> media and session descriptions. This is the Session Description
Protocol,
> SDP. The many uses of SDP have led to (requests for) numerous
extensions
> and have led to recognition of several flaws in the protocol design.
In
> spite of these, it is widely deployed.
>
> - To support this current deployment, MMUSIC will revise SDP
> suitable for publication as a Draft Standard RFC. This will involve
> correcting minor bugs and clarifying the current specification.
> - Various extensions to SDP will be pursued to remedy the most
> urgent of SDP's shortcomings. These will be limited to use of SDP in
> conjunction with connection-oriented media such as TCP and SCTP,
offering
> support to work with NATs and firewalls, exchange of media session
security
> keys.
>
> Apart from these, which are explicitly agreed to by the Area
Directors and
> shown in the milestones, only extensions within the existing
framework of
> SDP will be done (e.g. registering new codecs and defining
parameters for
> them extending SDP to include new address families).
>
> To address the more fundamental issues with SDP, a next generation
of SDP,
> referred to as SDPng, has been in progress and will be continued
towards a
> Proposed Standard RFC. A requirements document will be devised that
gathers
> the requirements from the areas in which SDP is currently deployed.
>
> MMUSIC will continue to maintain and revise the specification of the
Real
> Time Streaming Protocol (RTSP) based on implementation experience.
The RTSP
> specification will be revised to include various fixes and
clarifications.
> Depending on the changes, the revised RTSP specification will be
re-issued
> as either a Proposed or Draft Standard RFC. A MIB will be
considered.
>
> An Internet Media Guide (IMG) is a collection of multimedia session
> descriptions expressed using SDP, SDPng or some similar session
description
> format. It is used to describe a collection of multimedia sessions
(e.g.
> television programme schedules). The IMG must be delivered to a
> potentially large audience, who use it to join a subset of the
sessions
> described, and who may need to be notified of changes to the IMG.
>
> MMUSIC will investigate work on delivery mechanisms for IMGs,
generalizing
> its work on session announcement and discovery protocols (SAP, RTSP,
SIP).
> We will investigate and document requirements for IMG delivery
mechanisms,
> and identify the requirements that these delivery mechanisms impose
on the
> session description formats used by the IMG. We will then work to
produce
> a framework document outlining the use of (existing) protocols to
create an
> IMG delivery infrastructure. After successful completion of these
initial
> milestones for IMG delivery, the MMUSIC working group will decide
whether
> or not MMUSIC is the proper place to pursue any needed mechanisms
for IMGs,
> and if so, recharter accordingly
>
> The MMUSIC work items will be pursued in close coordination with
other IETF
> WGs related to multimedia conferencing and IP telephony (AVT, SIP,
SIPPING,
> IPTEL, MEGACO). Where appropriate, new separate working groups may
be split
> off (as has happened with the SIP WG).
>
> The Working Group is also charged with addressing security issues
related
> to the protocols it develops.
>
> Goals and Milestones:
>
> APR 03 Submit SDP source filter extensions for Proposed Standard
> MAY 03 Submit draft on SDPng motivations, comparisons with current
SDP
>        capabilities. Request charter review on SDPng work from IAB
and IESG.
> JUL 03 Submit revised SDP spec for Proposed Standard
> JUL 03 Submit IMG requirements and framework for Informational
> JUL 03 Review work on IMGs and update charter accordingly
> AUG 03 Submit SDPng base spec profile for Proposed Standard
> OCT 03 Submit revised RTSP spec for Proposed or Draft Standard (as
appropriate)
> OCT 03 Submit SDP Offer/Answer examples for Informational
> NOV 03 Submit SDP security extension for Proposed Standard
> NOV 03 Submit SDPng RTP profile spec for Proposed Standard
> NOV 03 Submit SDPng audio profile spec for Proposed Standard
> NOV 03 Submit SDPng video profile spec for Proposed Standard
> DEC 03 Submit RTSP MIB for Proposed Standard
>
>