I have a customer with two systems, one is a 424 v3 and the other is a 280 v3. I've put 2 adtran tsu120e's on each end to connect there p2p t1 circuit. the first 8 channels of the t1 are programmed for the phone system and the rest are for there data network. I setup the two cards in each system to be a 8 channel t1 card and setup the programming in *41-0,-1,-2 and *42. The 424 system is setup with a 200 series of extentions, and the 280 has the 300. If i select a t1 trunk on the 424 system I can make a call over the t1 link to the 280 and speak and hear the other party fine, if i try the same on the 280 i get nothing, the number just displays in the screen? Any suggestions?