I am the assigned Gen-ART reviewer for this draft. For background on
Gen-ART, please see the FAQ at

<

http://wiki.tools.ietf.org/area/gen/trac/wiki/GenArtfaq>.

Please resolve these comments along with any other Last Call comments
you may receive.

Document: draft-ietf-xrblock-rtcp-xr-qoe-12
    RTP Control Protocol (RTCP) Extended Report (XR) Blocks for
                       MOS Metric Reporting
Reviewer: Joel M. Halpern
Review Date: 12-November-2013
IETF LC End Date: 27-November-2013
IESG Telechat date: N/A



Summary: This document is nearly ready for publication as a Proposed 


Standard RFC




Major issues:

Moderate issues:


    In section 3.2.2 on Multi-Channel audio per SSRC Segment, the 


format description for the Calculation Algorithm ID (CAID) reads:



"The 8-bit ID is the local identifier of this segment in the range


1-255 inclusive."  I am pretty sure this is supposed to be an algorithm 


ID, not a segment index?






    The text in section 4.1 indicates that the number after "calg:" in 


the mapentry of the calgextmap is used as the ID in the CAID of the 


xrblock.  The packet format only allows 8 bits of value.  So why does 


the SDP format allow up to 5 digits?  Also, is there some reason that 


the special values 4095-4351 (in section 4.1) or 4096-4351 (in section 


4.2) are used rather than say equally invalid 512 through some 


appropriate upper bound still in 3 digits?




Minor issues:


    Please ensure that all acronyms are expanded on first use.  For 


example, QoE is not expanded.






    The notes in B.3 indicate that mostype was to be removed from the 


SDP grammar.  But it is still defined.  And section 4.2 still mentions 


it, even though it does not get referenced by the message format. Please 


finish removing it.  (also "most type")




Nits/editorial comments: