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IETF RFC 4733
[ACTIVE]

RTP Payload for DTMF Digits, Telephony Tones, and Telephony Signals

Metadata

Publisher
IETF
Doc Type
Standard
Pages
49
Abstract
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]
Publication Date
2006-12-01
Status Note
Proposed Standard
DOI
10.17487/RFC4733
Link
https://doi.org/10.17487/RFC4733
Author(s)
Henning Schulzrinne
Tom Taylor
Keyword(s)
RTP, DTMF
Latest version of IETF RFC 4733

Document Versions — IETF RFC 4733

  • ▶ IETF RFC 4733 (2006-12-01)
    THIS DOC [ACTIVE] [LATEST VERSION]

Amended by:

Normative Reference(s)

Bibliographic Reference(s)

  • Schulzrinne, H. and T. Taylor, "Definition of Events For Channel-Oriented Telephony Signalling", Work In Progress , November 2005. EXTERNAL
  • IETF RFC 2833 [Superseded*]
  • IETF RFC 3551 [Active*]
  • RFC4040 — 14 EXTERNAL
  • IETF RFC 4103 [Active*]
  • IETF RFC 4734 [Active*]
  • T-REC-E.180.1998 — ITU-T Recommendation E.180/Q.35 (1998): "Technical characteristics of tones for the telephone service". EXTERNAL
  • T-REC-G.711.1988 — CCITT Recommendation G.711 (1988), "Pulse Code Modulation (PCM) of voice frequencies". EXTERNAL
  • T-REC-G.723.1996 — 20 EXTERNAL
  • T-REC-G.729.1996 — 21 EXTERNAL
  • T-REC-Q.931.1998 — DSS1 EXTERNAL
  • T-REC-T.38.2003 — 23 EXTERNAL
  • T-REC-V.8.2000 — 24 EXTERNAL
  • T-REC-V.18.2000 — 27 EXTERNAL
  • T-REC-V.150.2003 — 25 EXTERNAL
  • T-REC-V.152.2005 — 26 EXTERNAL
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IETF RFC 4733, RTP Payload for DTMF Digits, Telephony Tones, and Telephony Signals. Available at https://doi.org/10.17487/RFC4733
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IETF RFC 4733, RTP Payload for DTMF Digits, Telephony Tones, and Telephony Signals. Available at https://doi.org/10.17487/RFC4733

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IETF RFC 4733, RTP Payload for DTMF Digits, Telephony Tones, and Telephony Signals. Available at https://doi.org/10.17487/RFC4733
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<span class="citation"><cite>IETF RFC 4733</cite>, RTP Payload for DTMF Digits, Telephony Tones, and Telephony Signals. Available at <a href="https://doi.org/10.17487/RFC4733" target="_blank" rel="noopener">https://doi.org/10.17487/RFC4733</a></span>

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IETF RFC 4733, RTP Payload for DTMF Digits, Telephony Tones, and Telephony Signals
doi: 10.17487/RFC4733
url: https://doi.org/10.17487/RFC4733
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<cite id="bib-rfc4733">IETF RFC 4733</cite>, RTP Payload for DTMF Digits, Telephony Tones, and Telephony Signals
<span class="doi">10.17487/RFC4733</span>
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