\begin{thebibliography}{10}

\bibitem{rfc2327}
M.~Handley and V.~Jacobson, \htmladdnormallink{``{SDP:} session description
  protocol,''}{http://www.rfc-editor.org/rfc/rfc2327.txt} RFC 2327, Internet
  Engineering Task Force, Apr. 1998.

\bibitem{rfc2119}
S.~Bradner, \htmladdnormallink{``Key words for use in {RFCs} to indicate
  requirement levels,''}{http://www.rfc-editor.org/rfc/rfc2119.txt} RFC 2119,
  Internet Engineering Task Force, Mar. 1997.

\bibitem{rfc2822}
\htmladdnormallink{``Internet message
  format,''}{http://www.rfc-editor.org/rfc/rfc2822.txt} RFC 2822, Internet
  Engineering Task Force, Apr. 2001.

\bibitem{rfc3263}
J.~Rosenberg and H.~Schulzrinne, \htmladdnormallink{``Session initiation
  protocol {(SIP):} locating {SIP}
  servers,''}{http://www.rfc-editor.org/rfc/rfc3263.txt} RFC 3263, Internet
  Engineering Task Force, June 2002.

\bibitem{rfc2396}
T.~Berners-Lee, R.~Fielding, and L.~Masinter, \htmladdnormallink{``Uniform
  resource identifiers {(URI):} generic
  syntax,''}{http://www.rfc-editor.org/rfc/rfc2396.txt} RFC 2396, Internet
  Engineering Task Force, Aug. 1998.

\bibitem{rfc2279}
F.~Yergeau, \htmladdnormallink{``{UTF-8,} a transformation format of {ISO}
  10646,''}{http://www.rfc-editor.org/rfc/rfc2279.txt} RFC 2279, Internet
  Engineering Task Force, Jan. 1998.

\bibitem{rfc2616}
R.~Fielding, J.~Gettys, J.~Mogul, H.~Frystyk, L.~Masinter, P.~Leach, and
  T.~Berners-Lee, \htmladdnormallink{``Hypertext transfer protocol --
  {HTTP/1.1},''}{http://www.rfc-editor.org/rfc/rfc2616.txt} RFC 2616, Internet
  Engineering Task Force, June 1999.

\bibitem{rfc2806}
A.~Vaha-Sipila, \htmladdnormallink{``{URLs} for telephone
  calls,''}{http://www.rfc-editor.org/rfc/rfc2806.txt} RFC 2806, Internet
  Engineering Task Force, Apr. 2000.

\bibitem{rfc2234}
\htmladdnormallink{``Augmented {BNF} for syntax specifications:
  {ABNF},''}{http://www.rfc-editor.org/rfc/rfc2234.txt} RFC 2234, Internet
  Engineering Task Force, Nov. 1997.

\bibitem{rfc2046}
N.~Freed and N.~Borenstein, \htmladdnormallink{``Multipurpose internet mail
  extensions {(MIME)} part two: Media
  types,''}{http://www.rfc-editor.org/rfc/rfc2046.txt} RFC 2046, Internet
  Engineering Task Force, Nov. 1996.

\bibitem{rfc1750}
D.~Eastlake, S.~Crocker, and J.~Schiller, \htmladdnormallink{``Randomness
  recommendations for security,''}{http://www.rfc-editor.org/rfc/rfc1750.txt}
  RFC 1750, Internet Engineering Task Force, Dec. 1994.

\bibitem{rfc3264}
J.~Rosenberg and H.~Schulzrinne, \htmladdnormallink{``An offer/answer model
  with session description protocol
  {(SDP)},''}{http://www.rfc-editor.org/rfc/rfc3264.txt} RFC 3264, Internet
  Engineering Task Force, June 2002.

\bibitem{rfc768}
J.~Postel, \htmladdnormallink{``User datagram
  protocol,''}{http://www.rfc-editor.org/rfc/rfc768.txt} RFC 768, Internet
  Engineering Task Force, Aug. 1980.

\bibitem{rfc761}
J.~Postel, \htmladdnormallink{``{DoD} standard transmission control
  protocol,''}{http://www.rfc-editor.org/rfc/rfc761.txt} RFC 761, Internet
  Engineering Task Force, Jan. 1980.

\bibitem{rfc2960}
R.~Stewart, Q.~Xie, K.~Morneault, C.~Sharp, H.~Schwarzbauer, T.~Taylor,
  I.~Rytina, M.~Kalla, L.~Zhang, and V.~Paxson, \htmladdnormallink{``Stream
  control transmission protocol,''}{http://www.rfc-editor.org/rfc/rfc2960.txt}
  RFC 2960, Internet Engineering Task Force, Oct. 2000.

\bibitem{rfc2617}
J.~Franks, P.~Hallam-Baker, J.~Hostetler, S.~Lawrence, P.~Leach, A.~Luotonen,
  and L.~Stewart, \htmladdnormallink{``{HTTP} authentication: Basic and digest
  access authentication,''}{http://www.rfc-editor.org/rfc/rfc2617.txt} RFC
  2617, Internet Engineering Task Force, June 1999.

\bibitem{rfc2183}
R.~Troost, S.~Dorner, K.~Moore, and Ed, \htmladdnormallink{``Communicating
  presentation information in internet messages: The content-disposition header
  field,''}{http://www.rfc-editor.org/rfc/rfc2183.txt} RFC 2183, Internet
  Engineering Task Force, Aug. 1997.

\bibitem{rfc3204}
E.~Zimmerer, J.~Peterson, A.~Vemuri, L.~Ong, F.~Audet, M.~Watson, and
  M.~Zonoun, \htmladdnormallink{``{MIME} media types for {ISUP} and {QSIG}
  objects,''}{http://www.rfc-editor.org/rfc/rfc3204.txt} RFC 3204, Internet
  Engineering Task Force, Dec. 2001.

\bibitem{rfc1123}
\htmladdnormallink{``Requirements for internet hosts - application and
  support,''}{http://www.rfc-editor.org/rfc/rfc1123.txt} RFC 1123, Internet
  Engineering Task Force, Oct. 1989.

\bibitem{rfc2277}
H.~Alvestrand, \htmladdnormallink{``{IETF} policy on character sets and
  languages,''}{http://www.rfc-editor.org/rfc/rfc2277.txt} RFC 2277, Internet
  Engineering Task Force, Jan. 1998.

\bibitem{rfc1847}
J.~Galvin, S.~Murphy, S.~Crocker, and N.~Freed, \htmladdnormallink{``Security
  multiparts for {MIME:} multipart/signed and
  multipart/encrypted,''}{http://www.rfc-editor.org/rfc/rfc1847.txt} RFC 1847,
  Internet Engineering Task Force, Oct. 1995.

\bibitem{rfc2630}
R.~Housley, \htmladdnormallink{``Cryptographic message
  syntax,''}{http://www.rfc-editor.org/rfc/rfc2630.txt} RFC 2630, Internet
  Engineering Task Force, June 1999.

\bibitem{rfc2633}
\htmladdnormallink{``{S/MIME} version 3 message
  specification,''}{http://www.rfc-editor.org/rfc/rfc2633.txt} RFC 2633,
  Internet Engineering Task Force, June 1999.

\bibitem{rfc2246}
T.~Dierks and C.~Allen, \htmladdnormallink{``The {TLS} protocol version
  1.0,''}{http://www.rfc-editor.org/rfc/rfc2246.txt} RFC 2246, Internet
  Engineering Task Force, Jan. 1999.

\bibitem{rfc2401}
S.~Kent and R.~Atkinson, \htmladdnormallink{``Security architecture for the
  internet protocol,''}{http://www.rfc-editor.org/rfc/rfc2401.txt} RFC 2401,
  Internet Engineering Task Force, Nov. 1998.

\bibitem{rfc3268}
P.~Chown, \htmladdnormallink{``Advanced encryption standard {(AES)}
  ciphersuites for transport layer security
  {(TLS)},''}{http://www.rfc-editor.org/rfc/rfc3268.txt} RFC 3268, Internet
  Engineering Task Force, June 2002.

\end{thebibliography}
