I have reviewed this document as part of the security directorate's ongoing effort to review all IETF documents being processed by the IESG. These comments were written primarily for the benefit of the security area directors. Document editors and WG chairs should treat these comments just like any other last call comments. This document describes the RTP Control Protocol Extended Report Block for Delay metric Reporting. As the security considerations section points out those statistics are not per-packet statistics, thus the risk of confidentiality does not apply, and the security considerations section points for RFC 3611 for more information. I see no security issues with this document. -- kivinen at iki.fi