I have a customer that has a Option 61c that has a PRI on it. They want to install a MICS 7.1 system for their administration offices in the same building and have the two systems connected together so they call call between systems and make and receive calls (DID)on the Option 61c. I assume we connect the two systems together with a T-1. How does the call routing get set up for incoming DID calls to the MICS system?