The IESG has approved the following document: - 'Measurement Identity and information Reporting using SDES item and XR Block' (draft-ietf-xrblock-rtcp-xr-meas-identity-10.txt) as Proposed Standard This document is the product of the Metric Blocks for use with RTCP's Extended Report Framework Working Group. The IESG contact persons are Gonzalo Camarillo and Robert Sparks. A URL of this Internet Draft is: http://datatracker.ietf.org/doc/draft-ietf-xrblock-rtcp-xr-meas-identity/ Technical Summary This document defines an RTP Control Protocol (RTCP) Source Description (SDES) item and an RTCP Extended Report (XR) Block carrying parameters that identify and describe a measurement period, to which one or more other RTCP XR Report Blocks may refer. The need for these is called out explicitly in section 5.4 of draft-ietf-avtcore-monarch-13, "Monitoring Architecture for RTP". Working Group Summary There were several points of debate within the working group; however, none were particularly rough and consensus was achieved in all cases. Main point of consensus include: Correlation Tag Remove the 3 bit correlation tag defined in earlier version of the document. The SSRC and CNAME can be used to correlate RTCP XR data. The RTCP SDES APSI block can be used to correlate with non-RTP sessions. Measurement Duration There was debate whether it was more appropriate to include in the measurement information block, or have it be included explicitly within each individual metric block to which it applies. The consensus was to include it within the measurement information block to avoid duplication in individual metric blocks, and add the following requirement in draft-ietf-avtcore-monarch, "Note that for packet loss robustness if the report blocks for the same interval span over more than one RTCP packet then each must have the measurement identity information even though they will be the same." Extended First/Last Sequence Number Paraphrasing of the concept defined in RFC 3550 led to some disagreements. The paraphrasing was replaced with references to section 6.4.1 and Appendix A.1 of RFC 3550 to avoid any potential ambiguity. Document Quality This document has been reviewed by multiple people in AVTCORE involved with draft-ietf-avtcore-monarch as well as by numerous people within XRBLOCK. This document is normatively referenced by other documents within XRBLOCK, providing evidence that there is intent to produce implementations according to this document. Personnel Charles Eckel is the Document Shepherd. Gonzalo Camarillo is the Responsible Area Director.
