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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