[USR-TC] Hello

I know its probably been asked 1000 times here. But I cant seem to find any of the posts on the lists. We are converting Channelized T1's to PRI's. We are using Hiper DSP cards. We do have an existing T that is a PRI. however when just changing the robbedbit to messageorientated The card will not keep calls. A single light on the card lights up and the call drops. Any suggestions would be much appreciated.