[MMUSIC] SDP Directorate: Review of draft-ietf-xrblock-rtcp-xr-qoe-08

"Ali C. Begen (abegen)" <abegen@cisco.com> Thu, 13 June 2013 09:14 UTC

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From: "Ali C. Begen (abegen)" <abegen@cisco.com>
To: "draft-ietf-xrblock-rtcp-xr-qoe@tools.ietf.org" <draft-ietf-xrblock-rtcp-xr-qoe@tools.ietf.org>
Thread-Topic: SDP Directorate: Review of draft-ietf-xrblock-rtcp-xr-qoe-08
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Date: Thu, 13 Jun 2013 09:14:10 +0000
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Subject: [MMUSIC] SDP Directorate: Review of draft-ietf-xrblock-rtcp-xr-qoe-08
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I am the assigned SDP directorate reviewer for this draft. For background on the SDP directorate, please see the FAQ at


Please wait for direction from your document shepherd or AD before posting a new version of the draft.

- I have a serious concern about the definition of QoE and usage of MOS in this draft.
- The RTCP XR extension syntax seems to have an issue.
- There are quite a few grammatical/capitalization/spelling errors. Please proofread the document.


- Section 1.3: s/guideline/guidelines, s/XR Block/XR block types

- Section 1.4: s/"Audio/Video"/"audio/video", s/transport-dependent/transport-specific

- Section 1.4: I don't understand what the following sentence means:

The factors in the second category are application-specific factors that affect real time application (e.g., video) quality and are sensitivity to network errors.

- Section 1.4: s/but not limited/but are not limited

- Section 1.4: I don't generally like the term "subscriber". Use more a more generic term like end-user, client, etc.

- Section 2.1: s/8:8/S8:8

- Section 3, first paragraph: The use of "recommended". These specific (2119) keywords are not supposed to be used in lower case.

- I don't agree with the following statement:

   Information is recorded about QoE metric which provides a
   measure that is indicative of the user's view of a service.

The application cannot possibly know a user's view of service unless the user explicitly enters that info in some fashion to the application.

- Section 3.1:

I think you should replace:

The fields corresponding to unreported parameters MUST be present, but are set to zero.


The fields corresponding to unreported parameters MUST be present, and MUST be set to zero.

- Section 4.1: "extmap" attribute was defined in 5285 not 4566.

- Section 4.1/4.2: Do not use "may/should/etc." in lower case. There are multiple occurrences of this.

- Section 4.1: "extmap" is already a registered attribute name. I did not understand why and in what way you want to use it.

- Section 4.2: s/indicates/indicate

- Section 4.1/4.2: Extra spaces in the SDP examples.


a = rtcp-xr:qoe-metrics = calg:1=G107,calg:2=P1202.1



- Section 5.1: Use the correct registry name: "RTP Control Protocol Extended Reports (RTCP XR) Block Type Registry"

6) Section 5.2: Use the correct registry name: "RTP Control Protocol Extended Reports (RTCP XR) Session Description Protocol (SDP) Parameters Registry".