First, go to Admin Settings → General in the top menu.
We know your 3CX installations might use dummy extensions to sort out different kinds of challenges in 3CX. Some of those extensions might not necessarily include data that you want to appear in the reports or wallboards.
Therefore, it is possible for you to choose which extensions to be visible. All extensions are enabled by default. You can easily untick those extensions you do not want to appear in the JEDWare System.
Find more Admin Settings info in the posts below