Source note · DTMF methods and interoperability failures
RFC 4733 places the duty to avoid double detection mainly on the receiving gateway; the checked sections contain no requirement that a sender mute in-band tones while sending events, so duplicate-digit protection cannot be assumed from the sender.
inferred · Checked 2026-09-24
- Vendor
- IETF
- Product
- RTP telephone-event payload
- Subsystem
- sender behaviour
- Deployment
- any
- Region
- not restricted
- Release range
- RFC 4733
- Status
- inferred
- 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 · Sections 2.5.1 and 2.5.2.2 (absence of a sender muting requirement in the sections checked)
Cite this note
APA
WarmTransfer. (2026, September 24). DTMF methods and interoperability failures: source note dtmf-interop-rfc4733-no-sender-mute-rule. WarmTransfer. https://warmtransfer.net/knowledge/claims/dtmf-interop-rfc4733-no-sender-mute-rule
BibTeX
@misc{warmtransfer-claim-dtmf-interop-rfc4733-no-sender-mute-rule,
title = {DTMF methods and interoperability failures: source note dtmf-interop-rfc4733-no-sender-mute-rule},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/dtmf-interop-rfc4733-no-sender-mute-rule},
note = {Source note dtmf-interop-rfc4733-no-sender-mute-rule, checked 2026-09-24}
}