\begin{thebibliography}{1}

\bibitem{rfc2119}
S.~Bradner, ``Key words for use in {RFCs} to indicate requirement levels,''
  Request for Comments 2119, Internet Engineering Task Force, Mar. 1997.

\bibitem{draft-ietf-mmusic-sdpng}
D.~Kutscher, J.~Ott, and C.~Bormann, ``Session description and capability
  negotiation,'' {Internet Draft}, Internet Engineering Task Force, Nov. 2001.
\newblock Work in progress.

\bibitem{isoN4509}
{ISO (International Organization for Standardization)}, ``Overview of the
  {MPEG-7} standard,'' {ISO} Standard ISO/IEC JTC1/SC29/WG11 N4509,
  International Organization for Standardization, Geneva, Switzerland, Dec.
  2001.

\bibitem{rfc2974}
M.~Handley, C.~Perkins, and E.~Whelan, ``Session announcement protocol,''
  Request for Comments 2974, Internet Engineering Task Force, Oct. 2000.

\bibitem{draft-ietf-sip-rfc2543bis}
J.~Rosenberg, H.~Schulzrinne, {\em et~al.}, ``{SIP}: Session initiation
  protocol,'' {Internet Draft}, Internet Engineering Task Force, Feb. 2002.
\newblock Work in progress.

\bibitem{draft-ietf-sip-events}
A.~Roach, ``{SIP}-specific event notification,'' {Internet Draft}, Internet
  Engineering Task Force, Feb. 2002.
\newblock Work in progress.

\bibitem{draft-wu-sipping-webshare}
X.~Wu and H.~Schulzrinne, ``Use {SIP} {MESSAGE} method for shared web
  browsing,'' {Internet Draft}, Internet Engineering Task Force, Nov. 2001.
\newblock Work in progress.

\end{thebibliography}
