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This draft is a work item of the Audio/Video Transport Working Group of the IETF.
Title : Definition of Events For Channel-Oriented Telephony Signalling
Author(s) : T. Taylor, H. Schulzrinne
Filename : draft-ietf-avt-rfc2833biscas-04.txt
Pages : 26
Date : 2007-5-29
This memo updates RFC 4733 to add event codes for telephony signals
used for channel-associated signalling when carried in the telephony
event RTP payload. It supersedes and adds to the original assignment
of event codes for this purpose in RFC 2833 section 3.14. As
documented in Appendix A of RFC 4733, certain of the RFC 2833 events
have been deprecated, because their specification was ambiguous,
erroneous or redundant. In fact, the degree of change from RFC 2833
section 3.14 is such that implementations of the present document
will be fully backward compatible with RFC 2833 implementations only
in the case of full ABCD-bit signalling. The positive benefits of
the present document are an expanded coverage of signalling systems
and a more carefully specified and documented coverage of signalling
systems covered by RFC 2833.
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