We would like to inform you of the on-going work on version 2.0   of the Real Time Streaming Protocol (RTSP) in the IETF MMUSIC   working group.  RTSP 2.0 is intended to obsolete and replace   RTSP 1.0.  We plan to freeze any protocol feature changes by   August 1st 2008 to complete RTSP 2.0 by the end of 2008.   The latest Internet-Draft can be found at:http://tools.ietf.org/html/draft-ietf-mmusic-rfc2326bis   The recently-publishedRFC 4775 [1] on "Procedures for Protocol   Extensions and Variations" defines guideline procedures for   cooperation between the IETF and outside entities on the   extension of IETF protocols.  It attempts to ensure that   extensions will conform to the applicable architectural   principles and technical criteria.  Any development of protocol   extensions and mechanisms related to RTSP would need to occur   under the guidelines ofRFC 4775.   We would like to request that any RTSP extensions that may be in   the scope of RTSP 2.0 or require IETF review (perRFC 4775) be   discussed in IETF MMUSIC working group to seek wider community   reviews and expert comments.  We would therefore appreciate if   you let us know if any group within your organization is working   on technical specifications that make use of RTSP and if any   protocol extensions are being considered.  In the case   extensions are being worked on, we would appreciate if you could   provide any details (requirements, mechanisms, draft solution,   etc.).   Sincerely,     Joerg Ott (MMUSIC co-chair)     Jean-Francois Mule (MMUSIC co-chair)Reference: [1]  Bradner S., Carpenter B., Narten T., "Procedures for Protocol      Extensions and Variations",RFC 4775, December 2006.http://tools.ietf.org/html/rfc4775