System has around 75 extensions but the tricky part is the customer has had set relocation turned on for years so hardly any of the extensions match the original port numbers.

Renumbering the DNs is a pain. You tell the system to change 222 to 245, 223 to 278, etc, you can only do a few at a time then exit programming, go back in to programming under maintenance and confirm which ports it moved 222 and 223 to. I've done it a couple times in the past and can get very time consuming. Guess a person could do a **startup and when it asks for the starting DN, enter 400 or something beyond the current numbering plan and then change them all back.