There is an IP Trunk between the two but the only entry in the ARS dialed digits form is one with the 4 digits of the remote cluster element ID, and does not include any part of the remote extensions. For example, I look in Controller A and see the remote cluster element ID as 8883. In the ARS dialed digits form I see digits dialed 8883, number of digits to follow 4 and it points to the IP Trunk. I don't get how a remote extension with digits 5678 is reachable by my phone sitting in Controller A.
I was hoping it was some simple Mitel concept I was failing to grasp, but this is pretty baffling to me.