As I understud you are trying to connect 2 system together, are you? I am not familiar with Comcast product. Is it channel bank? which converts T1 into POTS? If CICS has only 2 lines how are you going to use'em? Just call other side and make outgoing call of the MICS? Give more details, please. As you aware of CICS doesn't have a T1 capabilities.