Without seeing the config and event log, it would be difficult to say. Many times the carrier may believe that the problem is in one equipment, but never theirs. The best thing you can do is look at a event log to see what you are sending out to the carrier so that you can either
a) prove that digits are being sent
or
b) see that no digits are sent from quintum and start looking into the configuration to see where this may be set wrong.
MikeM
mike_voip@hotmail.com