McDewey

Scenario 1: Phones Not Register after Call Manager, TVS and ITL Certificate Renewal Note: This scenario apply to deployments under CUCM mixed-mode and non-secure clusters, in addition, applies to the self-signed certificates and CA certificates. When Call Manager , TVS and ITL certificates expired and they were renewed at the same time, It causes to have all our phones in an unregistered state thta causes a major Impact on the system, this is an expected behaviours as we trigger the phones to not trust in the CUCM. Verification

1. Ensure the certificates are already expired under Cisco Unified OS Administration >Security > Certificate Management