/mcpStep 2 Restart TVS and TFTP. Step 3 Reset all phones to verify that they download the new ITL file that disables ITL signature verification. Step 4 Configure Enterprise Parameter Secure https URLs to use HTTP instead of HTTPS. Note Unified Communications Manager Release 10.5 and later automatically resets phones after you enable the Prepare cluster for pre CM-8.0 rollback Enterprise Parameter. For Central TFTP server's Unified Communications Manager version and how to enable this parameter, see "Roll Back Cluster to a Pre-8.0 Release" section in the Security Guide for Cisco Unified Communications Manager. Obtain ITL File Status Use the following procedure to obtain an ITL file status of the phones. Procedure Step 1 From Cisco Unified Communications Manager Administration choose Device > Phone. Step 2 Choose ITL File Status in Find Phone where drop-down list and select the criteria. Note The following table is applicable only until Release 15. Description Field ITL Hash of server and phone are the same. Match ITL Hash of the server is not as that of the phone. MisMatch The phone fails to register to a new CUCM server and bounces back to its prior server. Not Installed The ITL Hash of the phone or the server is unknown. Unknown Note The following table is applicable from Release 15SU1 onwards. Description Field ITL Hash of any of the tftp servers and phone are the same. Match ITL Hash of the server is not as that of the phone or the ITL Hash of the phone or the server is unknown. MisMatch The phone fails to register to a new CUCM server and bounces back to its prior server. Not Installed Step 3 Click Find. Security Guide for Cisco Unified Communications Manager, Release 15 and SUs 30 An Introduction to Unified CM Security Obtain ITL File Status