Cisco ATA 186 not working with crecit card machine

I have a Cisco ATA 186 that had been working fine with a creidt card machine and then it stopped connecting to the host. I have changed the baud rate, phone lines, and CAT 5 lines.

The only thing that has changed on our network is we went from MGCP to H.323 shortly before the problem started, but I have another location that is using and ATA with a credit card machine and they are not reporting any problems.

Dose anyone know how to (or if it can be done) configure the ATA 186 to work with credit card machine.

Thanks,
Randy