Whether Unity Connection can run STARTTLS to a smart host on port 25 is unclear. The admin guide heading and the CUPI requirement both mention secure communication on ports 25 and 587, but the CUPI IsClientSecure description ties secure mode to port 587 and non-secure mode to port 25.
inferred · Checked 2026-10-02
- Vendor
- Cisco
- Product
- Unity Connection
- Subsystem
- SMTP client TLS
- Deployment
- on-premises
- Region
- not restricted
- Release range
- 14SU2 and later
- Status
- inferred
- Checked
- 2026-10-02
Sources
- Cisco Unity Connection Provisioning Interface (CUPI) API for SMTP Configuration — Cisco Systems · tier 2 current vendor documentation · IsClientSecure field description vs product requirement statement; compare cisco-cuc15-sag-messaging 'Over STARTTLS on Port 25 and 587' heading
Cite this note
APA
WarmTransfer. (2026, October 2). Troubleshooting Unity Connection voicemail-to-email and notifications: source note unity-connection-notification-troubleshooting-tls-port25-amb. WarmTransfer. https://warmtransfer.net/knowledge/claims/unity-connection-notification-troubleshooting-tls-port25-amb
BibTeX
@misc{warmtransfer-claim-unity-connection-notification-troubleshooting-tls-port25-amb,
title = {Troubleshooting Unity Connection voicemail-to-email and notifications: source note unity-connection-notification-troubleshooting-tls-port25-amb},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/unity-connection-notification-troubleshooting-tls-port25-amb},
note = {Source note unity-connection-notification-troubleshooting-tls-port25-amb, checked 2026-10-02}
}