I have reviewed this document as part of the security directorate's ongoing effort to review all IETF documents being processed by the IESG. Document editors and WG chairs should treat these comments just like any other last call comments. This draft specifies the addition of a new SDP attribute. This attribute does not appear to present any new type of security vulnerability. I believe the Security Considerations section needs a small addition to avoid being too vague. It currently just says "Therefore, as usual adequate security measures are RECOMMENDED ..." without giving any hint as to what those measures are or where to find any. Admittedly, this draft is an update to RFC 5760 and a reasonable non-exclusive list of such measures occurs in that RFC. Nevertheless, I would be much more comfortable if the Security Considerations section wording was augmented so it said "Therefore, adequate security measures, such as those listed in the Security Considerations section of [RFC5760], are RECOMMENDED...". Trivia: The following sentence: "The formal description of the 'multicast-rtcp' attribute is defined by the following ABNF [RFC5234] syntax:" somehow reads as sort of redundantly redundant. Maybe: "The following ABNF [RFC5234] syntax formally describes the 'multicast-rtcp' attribute:" Thanks, Donald =============================  Donald E. Eastlake 3rd   +1-508-333-2270 (cell)  d3e3e3 at gmail.com