Source note · Enabling mixed mode and encrypted calling in Unified CM
Cisco's CUCM-to-CUBE SIP TLS configuration note lists as a requirement that Unified CM be in mixed mode, with TCP 5061 open on transit firewalls and security and UCK9 licences on the CUBE.
Checked 2026-09-30
CUCM must be in mixed mode.
- Vendor
- Cisco
- Product
- Cisco Unified Communications Manager; Cisco Unified Border Element
- Subsystem
- SIP trunk
- Deployment
- on-premises
- Region
- not restricted
- Release range
- as written (2017)
- Checked
- 2026-09-30
Sources
- Configure SIP TLS between CUCM-CUBE/CUBE-SBC — Cisco Systems · tier 2 current vendor documentation · Prerequisites > Requirements
Cite this note
APA
WarmTransfer. (2026, September 30). Enabling mixed mode and encrypted calling in Unified CM: source note cucm-secure-calling-setup-cube-mixed-mode-prereq. WarmTransfer. https://warmtransfer.net/knowledge/claims/cucm-secure-calling-setup-cube-mixed-mode-prereq
BibTeX
@misc{warmtransfer-claim-cucm-secure-calling-setup-cube-mixed-mode-prereq,
title = {Enabling mixed mode and encrypted calling in Unified CM: source note cucm-secure-calling-setup-cube-mixed-mode-prereq},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/cucm-secure-calling-setup-cube-mixed-mode-prereq},
note = {Source note cucm-secure-calling-setup-cube-mixed-mode-prereq, checked 2026-09-30}
}