Source note · Modernizing a DTMF IVR to conversational AI
RFC 4733 specifies how DTMF signalling, other tone signals and telephony events are carried in RTP packets, and it obsoletes RFC 2833.
Checked 2026-09-30
This memo describes how to carry dual-tone multifrequency (DTMF) signalling, other tone signals, and telephony events in RTP packets.
- Vendor
- IETF
- Product
- RTP telephone-event payload
- Subsystem
- dtmf-transport
- Deployment
- any
- Region
- not restricted
- Release range
- RFC 4733, December 2006
- Checked
- 2026-09-30
Sources
- RTP Payload for DTMF Digits, Telephony Tones, and Telephony Signals — IETF · tier 1 standards and regulators · Abstract; header 'Obsoletes: 2833'
Cite this note
APA
WarmTransfer. (2026, September 30). Modernizing a DTMF IVR to conversational AI: source note ivr-modernization-rfc4733-dtmf-rtp. WarmTransfer. https://warmtransfer.net/knowledge/claims/ivr-modernization-rfc4733-dtmf-rtp
BibTeX
@misc{warmtransfer-claim-ivr-modernization-rfc4733-dtmf-rtp,
title = {Modernizing a DTMF IVR to conversational AI: source note ivr-modernization-rfc4733-dtmf-rtp},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/ivr-modernization-rfc4733-dtmf-rtp},
note = {Source note ivr-modernization-rfc4733-dtmf-rtp, checked 2026-09-30}
}