Source note · DTMF methods and interoperability failures
RFC 4733 maps DTMF digits 0-9 to event codes 0-9, star to 10, pound to 11, and A-D to 12-15.
Checked 2026-09-24
- Vendor
- IETF
- Product
- RTP telephone-event payload
- Subsystem
- event registry
- 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 3.2
Cite this note
APA
WarmTransfer. (2026, September 24). DTMF methods and interoperability failures: source note dtmf-interop-dtmf-event-codes. WarmTransfer. https://warmtransfer.net/knowledge/claims/dtmf-interop-dtmf-event-codes
BibTeX
@misc{warmtransfer-claim-dtmf-interop-dtmf-event-codes,
title = {DTMF methods and interoperability failures: source note dtmf-interop-dtmf-event-codes},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/dtmf-interop-dtmf-event-codes},
note = {Source note dtmf-interop-dtmf-event-codes, checked 2026-09-24}
}