How is your T-1 clocked? If it's a point-to-point, one of the Adtrans should be configured with timing source internal and the other to timing source t1 0/1 (or whichever T1 interface is connected to the other one. It doesn't matter which is which unless there is more than one T-1 involved. Then it can get interesting.
Clocking issues are a common T-1 configuration issue.
T-1 circuits need one and exactly one end of the circuit to generate timing, and the other to recover from the T1 line.