How to troubleshoot lack of audio in a call

OK. SO I have installed 3 different versions of this from AAH 2.5, AAH 2.8, and TrixBox 2.2…

None pass call audio via IAX. The client has been tested repeatedly against another box ia same ULAW and it gets audio there. On this new box… NOthing.

CLI shows the command to play audio occurs…
Nothing else seems to be happening…

I am totally stumped here… The card I have installed is a newer PRI card (TMP101 or soemthign) and it seems to get detected and configured without any problem…

THe server is an Acer machine with an Intel Pentium D 2.8 dual core…

Any ideas?