\begin{thebibliography}{10}

\bibitem{draft-ietf-mmusic-sdp-offer-answer}
J.~Rosenberg and H.~Schulzrinne, ``An offer/answer model with {SDP},''
  {Internet Draft}, Internet Engineering Task Force, Jan. 2002.
\newblock Work in progress.

\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{rfc1123}
R.~Braden, ``Requirements for internet hosts - application and support,''
  Request for Comments 1123, Internet Engineering Task Force, Oct. 1989.

\bibitem{rfc1738}
T.~Berners-Lee, L.~Masinter, and M.~McCahill, ``Uniform resource locators
  {(URL)},'' Request for Comments 1738, Internet Engineering Task Force, Dec.
  1994.

\bibitem{rfc1750}
D.~Eastlake, S.~Crocker, and J.~Schiller, ``Randomness recommendations for
  security,'' Request for Comments 1750, Internet Engineering Task Force, Dec.
  1994.

\bibitem{rfc1847}
J.~Galvin, S.~Murphy, S.~Crocker, and N.~Freed, ``Security multiparts for
  {MIME:} multipart/signed and multipart/encrypted,'' Request for Comments
  1847, Internet Engineering Task Force, Oct. 1995.

\bibitem{rfc2046}
N.~Freed and N.~Borenstein, ``Multipurpose internet mail extensions {(MIME)}
  part two: Media types,'' Request for Comments 2046, Internet Engineering Task
  Force, Nov. 1996.

\bibitem{rfc2183}
R.~Troost, S.~Dorner, and K.~Moore, ``Communicating presentation information in
  internet messages: The content-disposition header field,'' Request for
  Comments 2183, Internet Engineering Task Force, Aug. 1997.

\bibitem{rfc2246}
T.~Dierks and C.~Allen, ``The {TLS} protocol version 1.0,'' Request for
  Comments 2246, Internet Engineering Task Force, Jan. 1999.

\bibitem{rfc2277}
H.~Alvestrand, ``{IETF} policy on character sets and languages,'' Request for
  Comments 2277, Internet Engineering Task Force, Jan. 1998.

\bibitem{rfc2327}
M.~Handley and V.~Jacobson, ``{SDP:} session description protocol,'' Request
  for Comments 2327, Internet Engineering Task Force, Apr. 1998.

\bibitem{rfc2365}
D.~Meyer, ``Administratively scoped {IP} multicast,'' Request for Comments
  2365, Internet Engineering Task Force, July 1998.

\bibitem{rfc2396}
T.~Berners-Lee, R.~Fielding, and L.~Masinter, ``Uniform resource identifiers
  {(URI):} generic syntax,'' Request for Comments 2396, Internet Engineering
  Task Force, Aug. 1998.

\bibitem{rfc2401}
S.~Kent and R.~Atkinson, ``Security architecture for the internet protocol,''
  Request for Comments 2401, Internet Engineering Task Force, Nov. 1998.

\bibitem{rfc2616}
R.~Fielding, J.~Gettys, J.~Mogul, H.~Frystyk, L.~Masinter, P.~Leach, and
  T.~Berners-Lee, ``Hypertext transfer protocol -- {HTTP/1.1},'' Request for
  Comments 2616, Internet Engineering Task Force, June 1999.

\bibitem{rfc2617}
J.~Franks, P.~Hallam-Baker, J.~Hostetler, S.~Lawrence, P.~Leach, A.~Luotonen,
  and L.~Stewart, ``{HTTP} authentication: Basic and digest access
  authentication,'' Request for Comments 2617, Internet Engineering Task Force,
  June 1999.

\bibitem{rfc2630}
R.~Housley, ``Cryptographic message syntax,'' Request for Comments 2630,
  Internet Engineering Task Force, June 1999.

\bibitem{rfc2633}
B.~Ramsdell and Ed, ``{S/MIME} version 3 message specification,'' Request for
  Comments 2633, Internet Engineering Task Force, June 1999.

\bibitem{rfc2806}
A.~Vaha-Sipila, ``{URLs} for telephone calls,'' Request for Comments 2806,
  Internet Engineering Task Force, Apr. 2000.

\bibitem{rfc2822}
P.~Resnick and Editor, ``Internet message format,'' Request for Comments 2822,
  Internet Engineering Task Force, Apr. 2001.

\bibitem{rfc2960}
R.~Stewart, Q.~Xie, K.~Morneault, C.~Sharp, H.~Schwarzbauer, T.~Taylor,
  I.~Rytina, M.~Kalla, L.~Zhang, and V.~Paxson, ``Stream control transmission
  protocol,'' Request for Comments 2960, Internet Engineering Task Force, Oct.
  2000.

\bibitem{rfc761}
J.~Postel, ``{DoD} standard transmission control protocol,'' Request for
  Comments 761, Internet Engineering Task Force, Jan. 1980.

\bibitem{rfc768}
J.~Postel, ``User datagram protocol,'' Request for Comments 768, Internet
  Engineering Task Force, Aug. 1980.

\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{rfc2279}
F.~Yergeau, ``{UTF-8,} a transformation format of {ISO} 10646,'' Request for
  Comments 2279, Internet Engineering Task Force, Jan. 1998.

\bibitem{rfc2988}
V.~Paxson and M.~Allman, ``Computing {TCP's} retransmission timer,'' Request
  for Comments 2988, Internet Engineering Task Force, Nov. 2000.

\bibitem{rfc2069}
J.~Franks, P.~Hallam-Baker, J.~Hostetler, P.~Leach, A.~Luotonen, E.~Sink, and
  L.~Stewart, ``An extension to {HTTP} : Digest access authentication,''
  Request for Comments 2069, Internet Engineering Task Force, Jan. 1997.

\bibitem{rfc2234}
D.~Crocker, Ed., and P.~Overell, ``Augmented {BNF} for syntax specifications:
  {ABNF},'' Request for Comments 2234, Internet Engineering Task Force, Nov.
  1997.

\end{thebibliography}
