Is it possible to have an error window pop-up when you attempt to create a new extension using an already existing extension number? Sometimes extension numbers are restricted or used by paging, ring groups, etc… and do not show up in the Extension module listing when creating a new one.
Currently, using FreePBX 18.104.22.168 and earlier versions, after creating a new extension with an existing extension number, nothing happens after submitting. There is no feedback to the user that the extension is already in use. The user is left feeling that FreePBX broke. It would be nice if an error message appeared somewhere to say “Hey stupid, that extension number is already in use”