A new Request for Comments is now available in online RFC libraries.
RFC 4733
Title: RTP Payload for DTMF Digits,
Telephony Tones, and Telephony Signals
Author: H. Schulzrinne, T. Taylor
Status: Standards Track
Date: December 2006
Mailbox: schulzrinne@cs.columbia.edu,
taylor@nortel.com
Pages: 49
Characters: 115614
Obsoletes: RFC2833
See-Also:
I-D Tag: draft-ietf-avt-rfc2833bis-15.txt
URL: http://www.rfc-editor.org/rfc/rfc4733.txt
This memo describes how to carry dual-tone multifrequency (DTMF)
signalling, 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
conditionally reserved in case other documents revive their use.
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. 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. [STANDARDS TRACK]
This document is a product of the Audio/Video Transport
Working Group of the IETF.
This is now a Proposed Standard Protocol.
STANDARDS TRACK: This document specifies an Internet standards track
protocol for the Internet community,and requests discussion and
suggestions for improvements.Please refer to the current edition of the
Internet Official Protocol Standards (STD 1) for the standardization
state and status of this protocol. Distribution of this memo is
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