\begin{thebibliography}{10}

\bibitem{rfc3050}
J.~Lennox, H.~Schulzrinne, and J.~Rosenberg, ``Common gateway interface for
  {SIP},'' RFC 3050, Internet Engineering Task Force, Jan. 2001.

\bibitem{JCP0205:SIP}
{Java Community Process}, ``{SIP} servlet {API},'' Java Specification Requests
  JSR 116, Java Community Process, May 2002.

\bibitem{draft-ietf-iptel-cpl}
J.~Lennox and H.~Schulzrinne, ``{CPL}: A language for user control of internet
  telephony services,'' {Internet Draft}, Internet Engineering Task Force, Nov.
  2001.
\newblock Work in progress.

\bibitem{draft-wu-sipping-floor-control}
X.~Wu {\em et~al.}, ``Use {SIP} and {SOAP} for conference floor control,''
  {Internet Draft}, Internet Engineering Task Force, Apr. 2002.
\newblock Work in progress.

\bibitem{draft-ietf-simple-presence}
J.~Rosenberg, ``Session initiation protocol ({SIP}) extensions for presence,''
  {Internet Draft}, Internet Engineering Task Force, May 2002.
\newblock Work in progress.

\bibitem{rfc2397}
L.~Masinter, ``The "data" {URL} scheme,'' RFC 2397, Internet Engineering Task
  Force, Aug. 1998.

\bibitem{rfc2392}
E.~Levinson, ``Content-id and message-id uniform resource locators,'' RFC 2392,
  Internet Engineering Task Force, Aug. 1998.

\bibitem{draft-ietf-sipping-content-indirect}
S.~Olson, ``Requirements for content indirection in {SIP} messages,'' {Internet
  Draft}, Internet Engineering Task Force, June 2002.
\newblock Work in progress.

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

\bibitem{draft-campbell-pub-bind-reqs}
B.~Campbell, ``Requirements for binding published data to {SIP} services,''
  {Internet Draft}, Internet Engineering Task Force, May 2002.
\newblock Work in progress.

\bibitem{draft-ietf-iptel-sip-reg-payload}
J.~Lennox and H.~Schulzrinne, ``Transporting user control information in {SIP}
  {REGISTER} payloads,'' {Internet Draft}, Internet Engineering Task Force,
  Mar. 1999.
\newblock Work in progress.

\bibitem{draft-stucker-sip-publish}
B.~Stucker, ``{SIP}-specific network service publishing,'' {Internet Draft},
  Internet Engineering Task Force, Nov. 2001.
\newblock Work in progress.

\bibitem{rfc2251}
M.~Wahl, T.~Howes, and S.~Kille, ``Lightweight directory access protocol
  (v3),'' RFC 2251, Internet Engineering Task Force, Dec. 1997.

\bibitem{draft-beckmann-sip-reg-event}
G.~Mayer and M.~Beckmann, ``Registration event package,'' {Internet Draft},
  Internet Engineering Task Force, May 2002.
\newblock Work in progress.

\bibitem{draft-undery-sip-auth}
J.~Undery, S.~Sen, and V.~Torvinen, ``Enhanced usage of {HTTP} digest
  authentication for {SIP},'' {Internet Draft}, Internet Engineering Task
  Force, June 2002.
\newblock Work in progress.

\end{thebibliography}
