\begin{thebibliography}{1}

\bibitem{rfc2131}
R.~Droms, ``Dynamic host configuration protocol,'' Request for Comments 2131,
  Internet Engineering Task Force, Mar. 1997.

\bibitem{rfc2543}
M.~Handley, H.~Schulzrinne, E.~Schooler, and J.~Rosenberg, ``{SIP:} session
  initiation protocol,'' Request for Comments 2543, Internet Engineering Task
  Force, Mar. 1999.

\bibitem{draft-ietf-sip-srv}
H.~Schulzrinne and J.~Rosenberg, ``{SIP}: Session initiation protocol --
  locating {SIP} servers,'' {Internet Draft}, Internet Engineering Task Force,
  Mar. 2001.
\newblock Work in progress.

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

\bibitem{rfc1035}
P.~V. Mockapetris, ``Domain names - implementation and specification,'' Request
  for Comments 1035, Internet Engineering Task Force, Nov. 1987.

\bibitem{draft-ietf-dhc-concat}
T.~Lemon and S.~Cheshire, ``Encoding long {DHCP} options,'' {Internet Draft},
  Internet Engineering Task Force, Oct. 2001.
\newblock Work in progress.

\end{thebibliography}
