Source note · Unified CM certificate renewal
The rule against changing CallManager and TVS together follows from the ITL trust model. A phone that sees an unfamiliar ITL signer falls back to TVS, so if the TVS certificate changes in the same window the phone has no trusted path left.
inferred · Checked 2026-09-25
- Vendor
- Cisco
- Product
- Unified Communications Manager
- Subsystem
- itl
- Deployment
- on-premises
- Region
- not restricted
- Release range
- 10.0(1) and later
- Status
- inferred
- Checked
- 2026-09-25
Sources
- Unified Communications Manager ITL Enhancements in Version 10.0(1) — Cisco Systems · tier 2 current vendor documentation · Trust validation / TVS discussion, read with 217138 warning
Cite this note
APA
WarmTransfer. (2026, September 25). Unified CM certificate renewal: source note cucm-certificate-renewal-why-one-at-a-time. WarmTransfer. https://warmtransfer.net/knowledge/claims/cucm-certificate-renewal-why-one-at-a-time
BibTeX
@misc{warmtransfer-claim-cucm-certificate-renewal-why-one-at-a-time,
title = {Unified CM certificate renewal: source note cucm-certificate-renewal-why-one-at-a-time},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/cucm-certificate-renewal-why-one-at-a-time},
note = {Source note cucm-certificate-renewal-why-one-at-a-time, checked 2026-09-25}
}