Step 2. Verify that the phone has registered. Use “**#” to unlock your phone and delete the CTL & ITL files.Others will require you to navigate to the CTL & ITL files manually. Certain models will have a “reset security settings” option. Navigate to the security settings on your phone (the location can vary depending on the phone model).Step 1. Unlock the phone and delete the CTL and ITL files. Typically, this occurs with pre-used phones that retained the information of the previous CUCM. This first solution outlines one of the most common problems when introducing new devices to your CUCM. Try These Three Possible Solutions Solution 1 – Delete Trust Lists ZIRO can help you troubleshoot any Cisco UC issues you may be experiencing.Despite being an unpopular way to diagnose problems, phone traces can be a helpful workaround if you know what you’re looking for.Lastly, we’ll make sure the phone is able to download its files.The second solution will help in instances of no network availability.
We’ll first try to delete trust lists, which is a good first step if you’re trying to register a pre-used phone.This blog post will explore 3 different solutions to pursue to help you complete your Cisco phone registration in CUCM successfully.
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