I-D ACTION:draft-ietf-avt-rfc2833bis-14.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		: RTP Payload for DTMF Digits, Telephony Tones and Telephony Signals
	Author(s)	: H. Schulzrinne, T. Taylor
	Filename	: draft-ietf-avt-rfc2833bis-14.txt
	Pages		: 56
	Date		: 2006-6-6

This memo describes how to carry dual-tone multifrequency (DTMF)
signaling, other tone signals and telephony events in RTP packets.
It obsoletes RFC 2833.

This memo captures and expands upon the basic framework defined in
RFC 2833, but retains only the most basic event codes.  It sets up an
IANA registry to which other event code assignments may be added.
Companion documents add event codes to this registry relating to
modem, fax, text telephony, and channel-associated signalling events.
The remainder of the event codes defined in RFC 2833 are available
for reassignment.  See Appendix A for details, which include
reassignment of some event codes that apparently had no
implementation in the past and duplicated the meaning of other codes
that have been retained.

[RFC Editor: please change the Informative reference following RFC
4103 to the RFC number assigned to
draft-ietf-avt-rfc2833bisdata-07.txt, one of the "companion
documents" referred to above.]

In terms of procedure, this document provides a number of
clarifications to the original document.  However, it specifically
differs from RFC 2833 by removing the requirement that all compliant
implementations support the DTMF events.  Instead, compliant
implementations taking part in out-of-band negotiations of media
stream content indicate what events they support.  As well, this memo
adds three new procedures to the RFC 2833 framework: subdivision of
long events into segments, reporting of multiple events in a single
packet, and the concept and reporting of state events.

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