Source note · DTMF methods and interoperability failures
Cisco's CUBE DTMF technote (updated May 2023) states that Unified CM does not support SIP INFO for DTMF.
Checked 2026-09-24
SIP INFO is not supported by Unified CM
- Vendor
- Cisco
- Product
- Cisco Unified Communications Manager
- Subsystem
- SIP trunk DTMF
- Deployment
- on-premises
- Region
- not restricted
- Release range
- as of technote update 2023-05-15; not re-verified for CUCM 15
- Checked
- 2026-09-24
Sources
- Configure DTMF Relay on CUBE — Cisco Systems · tier 2 current vendor documentation · SIP INFO section
Cite this note
APA
WarmTransfer. (2026, September 24). DTMF methods and interoperability failures: source note dtmf-interop-cucm-no-sip-info. WarmTransfer. https://warmtransfer.net/knowledge/claims/dtmf-interop-cucm-no-sip-info
BibTeX
@misc{warmtransfer-claim-dtmf-interop-cucm-no-sip-info,
title = {DTMF methods and interoperability failures: source note dtmf-interop-cucm-no-sip-info},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/dtmf-interop-cucm-no-sip-info},
note = {Source note dtmf-interop-cucm-no-sip-info, checked 2026-09-24}
}