March 26 2009
Working Group
Home Page
Chairs
Eric Burger <eburger@standardstrack.com>
Spencer Dawkins <spencer@wonderhamster.org>
Notes taken by Bill VerSteeg
|
Topic |
Draft |
Time |
Discussion Leader |
|
Agenda bash |
none |
5 min |
chairs |
|
Status review |
none - see mailing list |
0 min |
chairs |
|
MIXER Framework - WGLC comments |
http://tools.ietf.org/id/draft-ietf-mediactrl-mixer-control-package-05.txt |
15 min |
Scott McGlashan |
|
Media Resource Broker Protocol |
60 min |
Lorenzo Miniero |
|
|
Call Flows |
http://tools.ietf.org/id/draft-ietf-mediactrl-call-flows-00.txt |
60 min |
Lorenzo Miniero |
|
Work plan for IETF 75 and shutdown |
charter |
10 min |
chairs |
· Need to clarify that <codec> attribute in <create_conference> puts a limit on the conference; i.e., <codec> drives, but does not replace, SDP negotiation
· Ready for RAI review of next revision
OK to have both HTTP+XML and SIP+XML (control channel) for MRB?
· Yes, HTTP+XML for redirect/oracle; SIP+XML for transparent pool
· If we need notifications, we’ll need to use SIP+XML
· Might be a burden for tiny, embedded MRB, but the expectation is that no MRB would be tiny as they are an element of a large network deployment
· Consensus is to mandate both protocols
Need to be able to identify sessions; consensus is to add a session ID
Publishing interface: new package to consolidate elements from individual MS packages; not clear what the package would be
Accuracy of MRB resource availability: consensus is that physics dictates availability will never be exact due to timing issues, computed as opposed to reserved resource consumption (e.g., DSP’s with fixed # of streams versus GPU’s with %CPU availability), and licensing (e.g., even if lots of CPU and memory available, licensing or other configuration elements may restrict number of stream types). Therefore, will have text in draft to highlight this situation and why we do not attempt to report exact resource availability. The reminder to the implementer is that reserving the resource by establishing a session is the only way to guarantee the resource is available.
The chairs will confirm on-list that people are actually going to use audit support for resource allocation.
Also, we need to make sure the text is clear that MEDIACTRL in general and this reporting in particular has no relation to predictive resource allocation. An example of that is a conference bridge that allows for oversubscription. The oversubscription occurs at the application layer in the AS; requests to the MS must be for the actual number of streams requested.
Alan Hawrylyshen will submit text describing security considerations for audit. Issues include scoping requests and hiding data, support for multi-tenant applications, and associating security policy and resource visibility to the requestor's credentials.
· Presentation of excellent Gin from chairs to Jon Peterson, outgoing RAI AD
What to report in audit: base data elements with extension elements. MRB aggregates status from MS in pool.
What does "supporting a codec" mean? Codec support can be ambiguous (decode, transcode, pass-through, RTP packetize, etc). Do we need this information?
Will a client poll the infrastructure to find a resource, or will it be pre-configured to use a specific device? Will the MRB hide the details of the servers? Today, clients are associated with devices that provide transcoding, etc. Rolling the clock forward, may need to dynamically find assets. Will take this issue to the list.
Proposal to use HTTP+XML, as done with CCMP, for the consumer interface had consensus in the room.
Items not in packages: Info the MRB needs which MS will/may not provide, like resource reservation, downtimes
Possibly in packages: more granularity on conference requests; geo location preference of MS location; language-related info for announcements and ASR.
Consensus is we have a sufficient number of use cases, with the addition of having some security-related call flows (SRTP, TLS, unauthorized requests) included. Nice to have XCON-related flows, but will not have a normative reference to XCON documents.
Chairs need to speak with mmusic to find out future of draft-boulton-mmusic-sdp-control-package-attribute-03.
Lorenzo finished with the usual well-received publicly-accessible demo.
Mixer to IESG moves from April 2009 to May 2009.
MRB WGLC stays in June 2009.
MRB to IESG moves from June 2009 to July 2009.
Call Flows WGLC stays in August 2009.
Call Flows to IESG stays in September 2009.