Source note · DTMF methods and interoperability failures
RFC 4733 recommends that a gateway render only the telephone-event payload once it is received, because the concurrent audio may contain spurious tones introduced by compression.
Checked 2026-09-24
It is RECOMMENDED that gateways render only the telephone-event payload once it is received, since the audio may contain spurious tones introduced by the audio compression algorithm.
- Vendor
- IETF
- Product
- RTP telephone-event payload
- Subsystem
- receiver behaviour
- Deployment
- any
- Region
- not restricted
- Release range
- RFC 4733
- Checked
- 2026-09-24
Sources
- RFC 4733: RTP Payload for DTMF Digits, Telephony Tones, and Telephony Signals — IETF / RFC Editor · tier 1 standards and regulators · Section 2.5.2.2 Playout of Tone Events
Cite this note
APA
WarmTransfer. (2026, September 24). DTMF methods and interoperability failures: source note dtmf-interop-gateway-render-events-only. WarmTransfer. https://warmtransfer.net/knowledge/claims/dtmf-interop-gateway-render-events-only
BibTeX
@misc{warmtransfer-claim-dtmf-interop-gateway-render-events-only,
title = {DTMF methods and interoperability failures: source note dtmf-interop-gateway-render-events-only},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/dtmf-interop-gateway-render-events-only},
note = {Source note dtmf-interop-gateway-render-events-only, checked 2026-09-24}
}