I just came across your post and was wondering if you made it work. We are using the D/240 and D/480 Dialogic cards and we did not set them up as ISDN. Our's is set up as AMI-basic, D4, Robbed-bit, Mulaw, Idle code 11111111, Near-end CSU Type: Other. Each of the 24 ports on each T-1 is set up...