\begin{thebibliography}{1}

\bibitem{draft-ietf-sip-rfc2543bis}
M.~Handley, H.~Schulzrinne, E.~Schooler, and J.~Rosenberg, ``{SIP}: Session
  initiation protocol,'' {Internet Draft}, Internet Engineering Task Force,
  Aug. 2000.
\newblock Work in progress.

\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, Mar.
  1999.
\newblock Work in progress.

\bibitem{draft-lennox-sip-cgi}
J.~Lennox, J.~Rosenberg, and H.~Schulzrinne, ``Common gateway interface for
  {SIP},'' {Internet Draft}, Internet Engineering Task Force, May 1999.
\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{rfc2782}
A.~Gulbrandsen, P.~Vixie, and L.~Esibov, ``A {DNS} {RR} for specifying the
  location of services {(DNS} {SRV)},'' Request for Comments 2782, Internet
  Engineering Task Force, Feb. 2000.

\bibitem{draft-ietf-sip-dhcp}
G.~Nair and H.~Schulzrinne, ``{DHCP} option for {SIP} servers,'' {Internet
  Draft}, Internet Engineering Task Force, Apr. 2000.
\newblock Work in progress.

\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{rfc2132}
S.~Alexander and R.~Droms, ``{DHCP} options and {BOOTP} vendor extensions,''
  Request for Comments 2132, Internet Engineering Task Force, Mar. 1997.

\bibitem{rfc2486}
B.~Aboba and M.~Beadles, ``The network access identifier,'' Request for
  Comments 2486, Internet Engineering Task Force, Jan. 1999.

\end{thebibliography}
