Each Cisco phone use CTL/ITL files to store a list of server certificates in the phone flash.

Having the wrong CTL/ITL files installed on phones can lead to major issues during an upgrade or migration as the phones will not trust the TFTP server and hence not download and update their configuration. Any changes to the phone's configuration will never be activated on the phone.

Read more about 'Why does a Cisco phone not apply new config settings?'

The UPLINX Remote Phone Control Tool's Bulk CTL/ITL Erase Wizard lets you easily delete the CTL/ITL files for a group of phones without visiting each phone; though phones must be registered. Deleting CTL/ITL files can typically only be performed manually on the phone and not from remote.

Erase invalid CTL-ITL files

The Bulk CTL/ITL Erase Wizard enables you to easily remove the CTL/ITL files when migrating a phone to a new CUCM server. If you plan to migrate your phones, please see the step-by-step guide at 'How to migrate Cisco phones to new CUCM servers'.

If you suspect invalid ITL files on your phone because the phones do not accept configuration changes from CUCM, please generate the free 'Invalid ITL report for Cisco phones' included in the UPLINX Phone Control Tool.


The UPLINX Phone Control Tool helps you with the following tasks to Erase CTL/ITL from Cisco phones:

Bulk operations, which are included in the desktop (engineering) edition, can also be executed from the command line and scripted to allow scheduled or repetitive execution.

To get started, download your trial version now and follow these steps to Bulk CTL/ITL Erase for Cisco phones.


The Bulk CTL/ITL Erase Wizard, along with all other bulk features, requires a Professional or Enterprise license.

Download now and see for yourself.

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