The Trust Verification Service (TVS) acts as a remote certificate trust store. Phones send it certificates they cannot verify from their local CTL or ITL, so they do not need to store every trusted certificate.
Checked 2026-10-01
- Vendor
- Cisco
- Product
- Unified Communications Manager
- Subsystem
- TVS
- Deployment
- on-premises
- Region
- not restricted
- Release range
- 8.0 and later
- Checked
- 2026-10-01
Sources
- Security Guide for Cisco Unified Communications Manager, Release 15 and SUs - Default Security — Cisco Systems · tier 2 current vendor documentation · Default Security > Trust Verification Service
Cite this note
APA
WarmTransfer. (2026, October 1). Troubleshooting phone trust and ITL failures in Unified CM: source note cucm-itl-trust-troubleshooting-tvs-remote-trust-store. WarmTransfer. https://warmtransfer.net/knowledge/claims/cucm-itl-trust-troubleshooting-tvs-remote-trust-store
BibTeX
@misc{warmtransfer-claim-cucm-itl-trust-troubleshooting-tvs-remote-trust-store,
title = {Troubleshooting phone trust and ITL failures in Unified CM: source note cucm-itl-trust-troubleshooting-tvs-remote-trust-store},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/cucm-itl-trust-troubleshooting-tvs-remote-trust-store},
note = {Source note cucm-itl-trust-troubleshooting-tvs-remote-trust-store, checked 2026-10-01}
}