\begin{thebibliography}{1}

\bibitem{rfc3050}
J.~Lennox, H.~Schulzrinne, and J.~Rosenberg, \htmladdnormallink{``Common
  gateway interface for {SIP},''}{http://www.rfc-editor.org/rfc/rfc3050.txt}
  RFC 3050, Internet Engineering Task Force, Jan. 2001.

\bibitem{draft-ietf-iptel-cpl}
J.~Lennox and H.~Schulzrinne, \htmladdnormallink{``{CPL}: A language for user
  control of internet telephony
  services,''}{http://www.ietf.org/internet-drafts/draft-ietf-iptel-cpl-05.txt%
,http://www.ietf.org/internet-drafts/draft-ietf-iptel-cpl-05.ps} {Internet
  Draft}, Internet Engineering Task Force, Nov. 2001.
\newblock Work in progress.

\bibitem{rfc3204}
E.~Zimmerer, J.~Peterson, A.~Vemuri, L.~Ong, F.~Audet, M.~Watson, and
  M.~Zonoun, \htmladdnormallink{``{MIME} media types for {ISUP} and {QSIG}
  objects,''}{http://www.rfc-editor.org/rfc/rfc3204.txt} RFC 3204, Internet
  Engineering Task Force, Dec. 2001.

\bibitem{rfc3372}
A.~Vemuri and J.~Peterson, \htmladdnormallink{``Session initiation protocol for
  telephones {(SIP-T):} {(SIP-T):} context and
  architectures,''}{http://www.rfc-editor.org/rfc/rfc3372.txt} RFC 3372,
  Internet Engineering Task Force, Sept. 2002.

\bibitem{draft-ietf-ieprep-security}
I.~Brown, \htmladdnormallink{``A security framework for emergency
  communications,''}{http://www.ietf.org/internet-drafts/draft-ietf-ieprep-sec%
urity-01.txt} {Internet Draft}, Internet Engineering Task Force, June 2002.
\newblock Work in progress.

\bibitem{draft-ietf-sip-privacy-general}
J.~Peterson, \htmladdnormallink{``A privacy mechanism for the session
  initiation protocol
  ({SIP}),''}{http://www.ietf.org/internet-drafts/draft-ietf-sip-privacy-gener%
al-01.txt} {Internet Draft}, Internet Engineering Task Force, June 2002.
\newblock Work in progress.

\bibitem{draft-ietf-sipping-nai-reqs}
M.~Watson, \htmladdnormallink{``Short term requirements for network asserted
  identity,''}{http://www.ietf.org/internet-drafts/draft-ietf-sipping-nai-reqs%
-02.txt} {Internet Draft}, Internet Engineering Task Force, June 2002.
\newblock Work in progress.

\end{thebibliography}
