Hi, 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. The document is very straightforward in that it describes codecs parameters and associated media types. I agree with the conclusions in the security considerations section: The codecs parameter itself does not alter the security considerations of any of the media types with which it is used. Each audio and video media type has its own set of security considerations that continue to apply, regardless of the use of the codecs parameter. Regards, Chris