\begin{thebibliography}{1}

\bibitem{draft-ietf-ieprep-sip-reqs}
H.~Schulzrinne, \htmladdnormallink{``Requirements for resource priority
  mechanisms for the session initiation
  protocol,''}{http://www.ietf.org/internet-drafts/draft-ietf-ieprep-sip-reqs-%
02.txt} {Internet Draft}, Internet Engineering Task Force, Dec. 2002.
\newblock Work in progress.

\bibitem{rfc3261}
J.~Rosenberg, H.~Schulzrinne, G.~Camarillo, A.~Johnston, J.~Peterson,
  R.~Sparks, M.~Handley, and E.~Schooler, \htmladdnormallink{``{SIP:} session
  initiation protocol,''}{http://www.rfc-editor.org/rfc/rfc3261.txt} RFC 3261,
  Internet Engineering Task Force, June 2002.

\end{thebibliography}
