\section{Acknowledgments}

We wish to thank the members of the IETF MMUSIC and SIP WGs for their
comments and suggestions.  Detailed comments were provided by
Ofir Arkin,
Brian Bidulock,
Jim Buller,
Neil Deason,
Dave Devanathan,
Keith Drage,
Bill Fenner,
Cedric Fluckiger,
Yaron Goland,
John Hearty,
Bernie Hoeneisen,
Jo Hornsby,
Phil Hoffer,
Christian Huitema,
Hisham Khartabil,
Jean Jervis,
Gadi Karmi,
Peter Kjellerstedt,
Anders Kristensen,
Jonathan Lennox,
Gethin Liddell,
Allison Mankin,
William Marshall,
Rohan Mahy,
Keith Moore,
Vern Paxson,
Bob Penfield,
Moshe J. Sambol,
Chip Sharp,
Igor Slepchin,
Eric Tremblay,
and Rick Workman.

Brian Rosen provided the compiled BNF.

Jean Mahoney provided technical writing assistance.

This work is based, inter alia, on
\citenonnorm{Scho9306:Case,Schu9603:Personal}. 
