[AVT] Re: Review draft-ietf-avt-avpf-ccm-07
Magnus Westerlund <magnus.westerlund@ericsson.com> Fri, 27 July 2007 00:58 UTC
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Date: Fri, 27 Jul 2007 02:58:29 +0200
From: Magnus Westerlund <magnus.westerlund@ericsson.com>
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To: "Even, Roni" <roni.even@polycom.co.il>
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Cc: bo.burman@ericsson.com, stewe@stewe.org, avt@ietf.org
Subject: [AVT] Re: Review draft-ietf-avt-avpf-ccm-07
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Hi Roni, Please see inline. Even, Roni skrev: >> > 2. In 4.2.1.2 " If the media sender concludes that it can increase the > > */ [RE:] I think a clarification will make sense. /* > Okay, I will include the following: This should be done also for point-to-point sessions, as it not guaranteed that a participant can determine correctly if the sources are present in a single node and co-ordinated. Is that okay? I only use should as it is strictly not needed if you are convinced that you can correctly determine that the back-off is not needed. >> > > */ [RE:] I am still not sure I understand. Example the offer includes > tmmbr, tstr and fir. The answer responds with tstr only. /* > > */ Does it mean that the answerer may send tmmbr, tstr and fir but the > offerer can only send tstr. /* > > */ Also if the above is right it will mean the answerer sending tmmbr > will be able to process the response. /* > Okay, I think there might be missing some word in there that these are symmetric and both side need to announce support for it to be possible to use it. These parameter does not make sense as declarative ones. Now the complete sectiond reads: 7.2. Offer-Answer The Offer/Answer [RFC3264] implications for codec control protocol feedback messages are similar to those described in [RFC4585]. The offerer MAY indicate the capability to support selected codec commands and indications. The answerer MUST remove all ccm parameters corresponding to the CCM messages that it does not support or does not desire to be used in this particular media session. The answerer MUST NOT add new ccm parameters in addition to what has been offered. The answer is binding for the media session and both offerer and answerer MUST only use feedback messages that both sides have explicitely indicated in the messages. In others words only the joint subset of CCM parameters from the offer and answer may be used. Note, that including a CCM parameter in an offer or answer indicates that the agent (offerer or answerer) is at least capable of receiving the corresponding CCM message(s) and act upon them. In cases when the reception of a negotiated CCM messages mandates the agent to respond with another CCM message, it also must have that capability. Although not mandated to initiate CCM messages of any negotiated type it is generally expected that the agent will initiate CCM messages when suitable. The session maximum packet rate parameter part of the TMMBR indication is declarative and everyone SHALL use the highest value indicated in a response. If the session maximum packet rate parameter is not present in an offer it SHALL NOT be included by the answerer. Cheers Magnus Westerlund IETF Transport Area Director & TSVWG Chair ---------------------------------------------------------------------- Multimedia Technologies, Ericsson Research EAB/TVM/M ---------------------------------------------------------------------- Ericsson AB | Phone +46 8 4048287 Torshamsgatan 23 | Fax +46 8 7575550 S-164 80 Stockholm, Sweden | mailto: magnus.westerlund@ericsson.com ---------------------------------------------------------------------- _______________________________________________ Audio/Video Transport Working Group avt@ietf.org https://www1.ietf.org/mailman/listinfo/avt
- [AVT] Working group last call: draft-ietf-avt-avp… Even, Roni
- Re: [AVT] Working group last call: draft-ietf-avt… Keith Lantz
- Re: [AVT] Working group last call: draft-ietf-avt… Randell Jesup
- Re: [AVT] Working group last call: draft-ietf-avt… Magnus Westerlund
- [AVT] Review draft-ietf-avt-avpf-ccm-07 Even, Roni
- Re: [AVT] Review draft-ietf-avt-avpf-ccm-07 Randell Jesup
- RE: [AVT] Review draft-ietf-avt-avpf-ccm-07 Even, Roni
- [AVT] End of working group last call: draft-ietf-… Even, Roni
- Re: [AVT] Review draft-ietf-avt-avpf-ccm-07 Randell Jesup
- RE: [AVT] Review draft-ietf-avt-avpf-ccm-07 Even, Roni
- [AVT] Re: Review draft-ietf-avt-avpf-ccm-07 Magnus Westerlund
- [AVT] RE: Review draft-ietf-avt-avpf-ccm-07 Even, Roni
- [AVT] Re: Review draft-ietf-avt-avpf-ccm-07 Magnus Westerlund
- [AVT] RE: Review draft-ietf-avt-avpf-ccm-07 Even, Roni