3551 [4]).
As this format transports encoded speech/audio, the main security
issues include confidentiality, integrity protection, and
authentication of the speech/audio itself. The payload format itself
does not have any built-in security mechanisms. Any suitable
external mechanisms, such as SRTP [12], MAY be used.
This payload format and the G.729.1 encoding do not exhibit any
significant non-uniformity in the receiver-end computational load and
thus are unlikely to pose a denial-of-service threat due to the
receipt of pathological datagrams.
9. IANA Considerations
IANA has registered audio/G7291 as a media subtype; see Section 6.1.
10. References
10.1. Normative References
[1] International Telecommunications Union, "G.729 based Embedded
Variable bit-rate coder: An 8-32 kbit/s scalable wideband coder
bitstream interoperable with G.729", ITU-T Recommendation
G.729.1, May 2006.
[2] Bradner, S., "Key words for use in RFCs to Indicate Requirement
Levels", BCP 14, RFC 2119, March 1997.
[3] Schulzrinne, H., Casner, S., Frederick, R., and V. Jacobson,
"RTP: A Transport Protocol for Real-Time Applications", STD 64,
RFC 3550, July 2003.
[4] Schulzrinne, H. and S. Casner, "RTP Profile for Audio and Video
Conferences with Minimal Control", STD 65, RFC 3551, July 2003.
[5] Handley, M., Jacobson, V., and C. Perkins, "SDP: Session
Description Protocol", RFC 4566, July 2006.
[6] Freed, N. and J. Klensin, "Media Type Specifications and
Registration Procedures", BCP 13, RFC 4288, December 2005.
[7] Casner, S. and P. Hoschka, "MIME Type Registration of RTP
Payload Formats", RFC 3555, July 2003.
[8] Rosenberg, J. and H. Schulzrinne, "An Offer/Answer Model with
Session Description Protocol (SDP)", RFC 3264, June 2002.
10.2. Informative References
[9] International Telecommunications Union, "Coding of speech at 8
kbit/s using conjugate-structure algebraic-code-excited linear-
prediction (CS-ACELP)", ITU-T Recommendation G.729, March 1996.
[10] Handley, M., Perkins, C., and E. Whelan, "Session Announcement
Protocol", RFC 2974, October 2000.
[11] Schulzrinne, H., Rao, A., and R. Lanphier, "Real Time Streaming
Protocol (RTSP)", RFC 2326, April 1998.
[12] Baugher, M., McGrew, D., Naslund, M., Carrara, E., and K.
Norrman, "The Secure Real-time Transport Protocol (SRTP)",
RFC 3711, March 2004.
Author’s Address
Aurelien Sollaud
France Telecom
2 avenue Pierre Marzin
Lannion Cedex 22307
France
Phone: +33 2 96 05 15 06
EMail: aurelien.sollaud@orange-ftgroup.com
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