I-D ACTION:draft-ietf-avt-rfc2833biscas-04.txt

A New Internet-Draft is available from the on-line Internet-Drafts 
directories.
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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