[MEDIACTRL] (no subject)
"MUNSON, GARY A (GARY A)" <gamunson@att.com> Mon, 03 March 2008 17:47 UTC
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From: "MUNSON, GARY A (GARY A)" <gamunson@att.com>
To: Chris Boulton <cboulton@avaya.com>, "Even, Roni" <roni.even@polycom.co.il>
Cc: mediactrl@ietf.org
Subject: [MEDIACTRL] (no subject)
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Hi Chris, Roni, Thanks for the latest version of draft-boulton-mediactrl-mrb (-02, February 6 2008). Below are some comments/suggestions from me for the next iteration. Cheers, Gary a) Section 1 "Intro", end of first paragraph. "Appropriate" is probably a better word than "accurate". b) It would be useful to make an observation in Section 3 "Problem Discussion" for the M:M case that another (optional) job of the MRB function may be to ensure that each application gets its fair share of media server resources, according to some pre-defined rules or policy. c) Somewhere it should be stated how the AS knows the address of the separate control channel of the selected Media Server resources. This is too important a topic to be left unspecified. (For Query, I'm assuming that the answer is that it can be included in the response from the MRB back to the AS. For In-Line ...??) d) Section 4.2 "In-Line MRB" first paragraph says "The client of the MRB simply uses the signaling to offload the decision making process" and later under Figure 8 says "The result of such an architecture is that the decision is left entirely to the MRB and the Application Server has no input into the selection process." --- I don't think those are good characterizations. With In-Line, the AS would still convey the attributes that it desires as payload (in the SIP INVITE). So the AS does have input into the selection process. And for either Query or MRB, it's true that the decision is left up to MRB, so that's not a distinguishing factor. e) In Section 5.2 it should be stated that, whereas the Consumer *Interface* is not needed for In-Line, the In-Line option can still use the same media resource characterization as would the Query option for the AS conveying to MRB what it wants. (i.e. payload in a SIP message instead of in an http/SOAP message). f) Related to (e) above, the draft cites the two options Query and In-Line, but does not say why two options should be considered instead of just one. My personal opinion is that Query is more versatile (I can give examples), while In-Line is simpler and probably suffices for at least common IVR scenarios. -- What are your thoughts about including such material? At present I think the reader not familiar with MRB would be perplexed as to why two options; although I believe that including both is the right approach. g) It should be stated that some information that the MRB may wish to know in some implementations to perform its role would have to come from or more naturally come from elsewhere than the Media Servers themselves. For example - the media resource allocation rules per application (as per (b) above) - planned and unplanned downtime - a simpler MS categorization than raw capabilities (e.g., a 'red' or 'blue' Media Server resource) - reservations (especially for conferencing) - schedules of future MS resource additions (useful - related to reservations) h) Related to (g) above, it should be stated that, while the various figures show the Publishing interface as going between the Media Servers and MRB, it could also be the case that there is some intermediate System X (e.g., an operations system) that has the Publishing interface with MRB. System X is aware of the media server resources and their attributes etc. i) Related to (g) and (h) above, it would therefore be good to allow the kinds of items cited in comment (g) to be included in the so-called Publishing Interface. j) Other things to add as items in Section 5.2 AS request to MRB: - application identifier - conference ID (as appropriate) - 1st-choice attributes set; 2nd-choice attributes set - control package that the AS wants to use - request to release or add more resources (e.g. for conference call); not in the initial request MRB response to AS: - MS resource address for separate control channel - whether 1st-choice or 2nd-choice was assigned k) Other things to add as items in Section 5.1 - control packages supported - specific announcement sets supported (not all MS will have the same sets); could generalize to other types of content _______________________________________________ MEDIACTRL mailing list MEDIACTRL@ietf.org https://www.ietf.org/mailman/listinfo/mediactrl Supplemental Web Site: http://www.standardstrack.com/ietf/mediactrl
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