/mcpSelect Reset, then you see a pop-up with the statement "You are about to reset all devices in the system. This action cannot be undone. Continue?",select OK, and then select Reset. ○ This method resets ALL components in Call Manager. ○ Option 2 • Cisco Unified CM Administration > Bulk Administration > Phones > Update Phones > Query Search for Device Name begins with SEP > Next > Reset Phones > Run Immediately ○ • The phones now reset. Monitor their actions via RTMT tool to ensure the reset was successful and that devices register back to CUCM. Wait for the phone registration to complete before you proceed to next certificate. This process of phones registration can take some time. Be advised, devices that had bad ITLs prior to regeneration process do not register back to the cluster until ITL is remove. TVS Certificate Warning: Do not regenerate CallManager.PEM and TVS.PEM certificates at the same time in versions 8.x-11.5, or if the ITL is signed by the Call Manager Certificate. This causes an unrecoverable mismatch to the installed ITL on endpoints which require the removal the ITL from ALL endpoints in the cluster, or restore from DRS to begin the certificate updates again. Note: TVS authenticates certificates on behalf of Call Manager. Regenerate this certificate last. Navigate to each server in your cluster (in separate tabs of your web browser) begin with the publisher, then each subscriber. Navigate to Cisco Unified OS Administration > Security > Certificate Management > Find. Select the TVS pem Certificate. • Once open, select Regenerate and wait until you see the Success pop-up then close pop-up or go back and select Find/List. • Continue with subsequent subscribers; perform the same procedure in step 1 and complete on all subscribers in your cluster. After all Nodes have regenerated the TVS certificate, restart the services: Log into Publisher Cisco Unified Serviceabililty. Navigate to Cisco Unified Serviceability > Tools > Control Center - Network Services ○ On the publisher select Restart on Cisco Trust Verification Service. ○ ○ Once the service restart completes, continue with the subscribers and restart the Cisco Trust Verification Service. ○ • 1. Begin with the Publishe,r then continue with the subscribers, restart Cisco TFTP Service where status shows Started. 2. Reboot all Phones: Option 1 • Cisco Unified CM Administration > System > Enterprise Parameters Select Reset, then you see a pop-up with the statement "You are about to reset all devices in the system. This action cannot be undone. Continue?",select OK, and then select Reset. ○ This method resets ALL components in Call Manager. ○ • Option 2 • Cisco Unified CM Administration > Bulk Administration > Phones > Update Phones > Query • 3.