\begin{thebibliography}{1}

\bibitem{draft-schulzrinne-sip-911}
H.~Schulzrinne, ``Providing emergency call services for sip-based internet
  telephony,'' {Internet Draft}, Internet Engineering Task Force, July 2000.
\newblock Work in progress.

\bibitem{rfc2916}
P.~Faltstrom, ``{E.164} number and {DNS},'' Request for Comments 2916, Internet
  Engineering Task Force, Sept. 2000.

\bibitem{draft-ietf-sip-privacy}
W.~Marshall {\em et~al.}, ``{SIP} extensions for caller identity and privacy,''
  {Internet Draft}, Internet Engineering Task Force, Nov. 2000.
\newblock Work in progress.

\bibitem{rfc1984}
IAB and IESG, ``{IAB} and {IESG} statement on cryptographic technology and the
  internet,'' Request for Comments 1984, Internet Engineering Task Force, Aug.
  1996.

\end{thebibliography}
