fraud.
Additional security considerations are described in RFC2198 [6].
8 IANA Considerations
This document defines two new RTP payload formats, named telephone-
event and tone, and associated Internet media (MIME) types,
audio/telephone-event and audio/tone.
Within the audio/telephone-event type, additional events MUST be
registered with IANA. Registrations are subject to approval by the
current chair of the IETF audio/video transport working group, or by
an expert designated by the transport area director if the AVT group
has closed.
The meaning of new events MUST be documented either as an RFCor an
equivalent standards document produced by another standardization
body, such as ITU-T.
9 Acknowledgements
The suggestions of the Megaco working group are gratefully
acknowledged. Detailed advice and comments were provided by Fred
Burg, Steve Casner, Fatih Erdin, Bill Foster, Mike Fox, Gunnar
Hellstrom, Terry Lyons, Steve Magnell, Vern Paxson and Colin Perkins.
10 Authors' Addresses
Henning Schulzrinne
Dept. of Computer Science
Columbia University
1214 Amsterdam Avenue
New York, NY 10027
USA
EMail: schulzrinne@cs.columbia.edu
Scott Petrack
MetaTel
45 Rumford Avenue
Waltham, MA 02453
USA
EMail: scott.petrack@metatel.com
11 Bibliography
[1] Schulzrinne, H., Casner, S., Frederick, R. and V. Jacobson,
"RTP: A Transport Protocol for Real-Time Applications", RFC
1889, January 1996.
[2] Bradner, S., "Key words for use in RFCs to Indicate Requirement
Levels", BCP 14, RFC2119, March 1997.
[3] International Telecommunication Union, "Procedures for starting
sessions of data transmission over the public switched telephone
network," Recommendation V.8, Telecommunication Standardization
Sector of ITU, Geneva, Switzerland, Feb. 1998.
[4] R. Kocen and T. Hatala, "Voice over frame relay implementation
agreement", Implementation Agreement FRF.11, Frame Relay Forum,
Foster City, California, Jan. 1997.
[5] International Telecommunication Union, "Multifrequency push-
button signal reception," Recommendation Q.24, Telecommunication
Standardization Sector of ITU, Geneva, Switzerland, 1988.
[6] Perkins, C., Kouvelas, I., Hodson, O., Hardman, V., Handley, M.,
Bolot, J., Vega-Garcia, A. and S. Fosse-Parisis, "RTP Payload
for Redundant Audio Data", RFC2198, September 1997.
[7] Handley M. and V. Jacobson, "SDP: Session Description Protocol",
RFC2327, April 1998.
[8] International Telecommunication Union, "Automatic answering
equipment and general procedures for automatic calling equipment
on the general switched telephone network including procedures
for disabling of echo control devices for both manually and
automatically established calls," Recommendation V.25,
Telecommunication Standardization Sector of ITU, Geneva,
Switzerland, Oct. 1996.
[9] International Telecommunication Union, "Procedures for document
facsimile transmission in the general switched telephone
network," Recommendation T.30, Telecommunication Standardization
Sector of ITU, Geneva, Switzerland, July 1996.
[10] International Telecommunication Union, "Echo cancellers,"
Recommendation G.165, Telecommunication Standardization Sector
of ITU, Geneva, Switzerland, Mar. 1993.
[11] International Telecommunication Union, "A modem operating at
data signaling rates of up to 33 600 bit/s for use on the
general switched telephone network and on leased point-to-point
2-wire telephone-type circuits," Recommendation V.34,
Telecommunication Standardization Sector of ITU, Geneva,
Switzerland, Feb. 1998.
[12] International Telecommunication Union, "Procedures for the
identification and selection of common modes of operation
between data circuit-terminating equipments (DCEs) and between
data terminal equipments (DTEs) over the public switched
telephone network and on leased point-to-point telephone-type
circuits," Recommendation V.8bis, Telecommunication
Standardization Sector of ITU, Geneva, Switzerland, Sept. 1998.
[13] International Telecommunication Union, "Application of tones and
recorded announcements in telephone services," Recommendation
E.182, Telecommunication Standardization Sector of ITU, Geneva,
Switzerland, Mar. 1998.
[14] Bellcore, "Functional criteria for digital loop carrier
systems," Technical Requirement TR-NWT-000057, Telcordia
(formerly Bellcore), Morristown, New Jersey, Jan. 1993.
[15] J. G. van Bosse, Signaling in Telecommunications Networks
Telecommunications and Signal Processing, New York, New York:
Wiley, 1998.
[16] International Telecommunication Union, "AAL type 2 service
specific convergence sublayer for trunking," Recommendation
I.366.2, Telecommunication Standardization Sector of ITU,
Geneva, Switzerland, Feb. 1999.
[17] International Telecommunication Union, "Various tones used in
national networks," Recommendation Supplement 2 to
Recommendation E.180, Telecommunication Standardization Sector
of ITU, Geneva, Switzerland, Jan. 1994.
[18] International Telecommunication Union, "Technical
characteristics of tones for telephone service," Recommendation
Supplement 2 to Recommendation E.180, Telecommunication
Standardization Sector of ITU, Geneva, Switzerland, Jan. 1994.
[19] Schulzrinne, H., "RTP Profile for Audio and Video Conferences
with Minimal Control", RFC1890, January 1996.
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