RFC 4733 says the final packet of each event should be sent three times, so a capture normally shows three end packets for one key press.
Checked 2026-10-02
The final packet for each event and for each segment SHOULD be sent a total of three times at the interval used by the source for updates.
- Vendor
- not restricted
- Product
- not restricted
- Subsystem
- RTP telephone-event
- Deployment
- standard
- Region
- not restricted
- Release range
- RFC 4733
- Checked
- 2026-10-02
Sources
- RFC 4733: RTP Payload for DTMF Digits, Telephony Tones, and Telephony Signals — IETF / RFC Editor · tier 1 standards and regulators · Section 2.5.1.4
Cite this note
APA
WarmTransfer. (2026, October 2). Troubleshooting DTMF digits not detected in Webex Contact Center flows: source note wxcc-dtmf-troubleshooting-rfc4733-end-pkt-x3. WarmTransfer. https://warmtransfer.net/knowledge/claims/wxcc-dtmf-troubleshooting-rfc4733-end-pkt-x3
BibTeX
@misc{warmtransfer-claim-wxcc-dtmf-troubleshooting-rfc4733-end-pkt-x3,
title = {Troubleshooting DTMF digits not detected in Webex Contact Center flows: source note wxcc-dtmf-troubleshooting-rfc4733-end-pkt-x3},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/wxcc-dtmf-troubleshooting-rfc4733-end-pkt-x3},
note = {Source note wxcc-dtmf-troubleshooting-rfc4733-end-pkt-x3, checked 2026-10-02}
}