If the cluster is not in mixed mode, a CTI, JTAPI or TAPI application cannot access the CTL file and connects to CTIManager over nonsecure port 2748 instead of TLS.
Checked 2026-10-02
- Vendor
- Cisco
- Product
- Unified Communications Manager
- Subsystem
- Secure CTI
- Deployment
- on-premises
- Region
- not restricted
- Release range
- Release 15 and SUs
- Checked
- 2026-10-02
Sources
- Security Guide for Cisco Unified Communications Manager Release 15 - Authentication and Encryption Setup for CTI, JTAPI, and TAPI — Cisco Systems · tier 2 current vendor documentation · Authentication and Encryption Setup for CTI, JTAPI, and TAPI > Standard CTI Secure Connection when cluster security mode is nonsecure
Cite this note
APA
WarmTransfer. (2026, October 2). Troubleshooting CTI applications that cannot control phones in Unified CM: source note cucm-cti-troubleshooting-nonmixed-falls-back-2748. WarmTransfer. https://warmtransfer.net/knowledge/claims/cucm-cti-troubleshooting-nonmixed-falls-back-2748
BibTeX
@misc{warmtransfer-claim-cucm-cti-troubleshooting-nonmixed-falls-back-2748,
title = {Troubleshooting CTI applications that cannot control phones in Unified CM: source note cucm-cti-troubleshooting-nonmixed-falls-back-2748},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/cucm-cti-troubleshooting-nonmixed-falls-back-2748},
note = {Source note cucm-cti-troubleshooting-nonmixed-falls-back-2748, checked 2026-10-02}
}