\begin{thebibliography}{1}

\bibitem{rfc2483}
M.~Mealling and R.~Daniel, ``{URI} resolution services necessary for {URN}
  resolution,'' Request for Comments 2483, Internet Engineering Task Force,
  Jan. 1999.

\bibitem{rfc2068}
R.~Fielding, J.~Gettys, J.~Mogul, H.~Frystyk, and T.~Berners-Lee, ``Hypertext
  transfer protocol -- {HTTP/1.1},'' Request for Comments 2068, Internet
  Engineering Task Force, Jan. 1997.

\bibitem{Rose9803:Timer}
J.~Rosenberg and H.~Schulzrinne, ``Timer reconsideration for enhanced {RTP}
  scalability,'' in {\em Proceedings of the Conference on Computer
  Communications (IEEE Infocom)}, (San Francisco, California), March/April
  1998.

\bibitem{draft-lennox-sip-reg-payload}
J.~Lennox and H.~Schulzrinne, ``Transporting user control information in {SIP}
  {REGISTER} payloads,'' {Internet Draft}, Internet Engineering Task Force,
  Oct. 2000.
\newblock Work in progress.

\end{thebibliography}
