Are you SURE it's not the Mitel GX5000? How did you determine that? Most Mitel systems can be programmed to 'inspect' the number dialed and allow or deny completion of the call. They can inspect a number dialed down to the last digit and allow calls with a specific digit thru and deny the rest. They do it so quickly that the process is transparent to the user. And the Mitel can generate dial tone after you dial 9 or whatever your access code is and re-order, as well. And for other readers, most other brands have the same capabilities.

When I was young, I was Liberal. As I aged and wised up, I became Conservative. Now that I'm old, I have settled on Curmudgeon.