Source note · Troubleshooting Cisco IP phone registration
The Trust Verification Service (TVS) runs on Unified CM on TCP port 2445 and authenticates certificates the phone does not already trust, so the phone need not hold a full trust store.
Checked 2026-09-24
- Vendor
- Cisco
- Product
- Unified Communications Manager
- Subsystem
- Security By Default
- Deployment
- on-premises
- Region
- not restricted
- Release range
- CUCM 8.0 and later
- Checked
- 2026-09-24
Sources
- Understand CUCM Security By Default and ITL Operation and Troubleshooting — Cisco Systems · tier 2 current vendor documentation · Understand CUCM Security By Default and ITL Operation and Troubleshooting > TVS
Cite this note
APA
WarmTransfer. (2026, September 24). Troubleshooting Cisco IP phone registration: source note cisco-phone-registration-troubleshooting-tvs-2445. WarmTransfer. https://warmtransfer.net/knowledge/claims/cisco-phone-registration-troubleshooting-tvs-2445
BibTeX
@misc{warmtransfer-claim-cisco-phone-registration-troubleshooting-tvs-2445,
title = {Troubleshooting Cisco IP phone registration: source note cisco-phone-registration-troubleshooting-tvs-2445},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/cisco-phone-registration-troubleshooting-tvs-2445},
note = {Source note cisco-phone-registration-troubleshooting-tvs-2445, checked 2026-09-24}
}