I have a Magix with a PRI. I ordered some more DID's and am having a problem re-numbering the current default extensions to the new DID's (last 4 digits). Example: I go to re-number, single, extension and when it asks for the old extension I enter 7118, new extension I entered 8450, it doesn't accept 8450. Is the dial plan causing the issue? Currently it's using 801 through 828. The existing DID's end with 58XX and I didn't have any problems re-numbering with them.