Yes, I supplied the DID number to the telco for the re-routing, so I am sure that is how it is routed. It was previously routed to a completely different number for a call center host.

I added a DID for the toll-free number already and routed it to the DN thinking maybe that would get it to roll over correctly to voice mail but it still goes immediately to the Auto-attendant when the line is busy.

If I just have them route it to the primary number on the PRI I should be able to route it to the DN as a DID using the last 4, correct? If so I will just call them back and have them change it.