Source note · DTMF methods and interoperability failures
Cisco's proprietary cisco-rtp DTMF relay (payload type 121) has been discontinued on CUBE.
Checked 2026-09-24
- Vendor
- Cisco
- Product
- Cisco Unified Border Element
- Subsystem
- dtmf-relay
- Deployment
- on-premises
- Region
- not restricted
- Release range
- IOS XE 17.6 onwards
- Checked
- 2026-09-24
Sources
- Cisco Unified Border Element Configuration Guide - Cisco IOS XE 17.6 Onwards - DTMF Relay — Cisco Systems · tier 2 current vendor documentation · DTMF Relay chapter, cisco-rtp description
Cite this note
APA
WarmTransfer. (2026, September 24). DTMF methods and interoperability failures: source note dtmf-interop-cube-cisco-rtp-discontinued. WarmTransfer. https://warmtransfer.net/knowledge/claims/dtmf-interop-cube-cisco-rtp-discontinued
BibTeX
@misc{warmtransfer-claim-dtmf-interop-cube-cisco-rtp-discontinued,
title = {DTMF methods and interoperability failures: source note dtmf-interop-cube-cisco-rtp-discontinued},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/dtmf-interop-cube-cisco-rtp-discontinued},
note = {Source note dtmf-interop-cube-cisco-rtp-discontinued, checked 2026-09-24}
}