IETF Multiparty Multimedia Session Control (mmusic) Working Group
   Responsible for the creation and maintenance of the RTSP specification
   http://www.ietf.org/html.charters/mmusic-charter.html

Internet Streaming Media Alliance (ISMA)
   Group promoting the use of RTSP, RTP, and a subset of the MPEG-4 specification.
   http://www.isma.tv

RFC 2326
   Official RTSP specification, published by the Internet Engineering Task Force (IETF)
   http://tools.ietf.org/html/rfc2326

SourceForge RTSP Specification Tracker
   Official issue/errata list for RTSP, from which the future version of the RTSP specification will be made.
   http://sourceforge.net/projects/rtspspec

Unofficial IETF MMUSIC WG Page
   Information about meetings and documents of the Multiparty Multimedia Session Control WG within the Transport Area of the IETF
   http://www.dmn.tzi.org/ietf/mmusic/