My 2 cents here. A while back I went nuts trying to debug a problem that was related to a not being able to successfully dial into a RAD. It would connect then hang up shortly. It turned out that the Services card (thats the other function on a combo card) was an older revision and while the T1 worked properly, the timing for analog devices was off and thats why my RAD modem did not work. Your fax problem sounds very similar. Can you try and see if you can stay connected with a rad at this point? If not, change one of the combo cards until the faxing problem goes away, cause it just might work. Check to see if either of the combo cards is rev 1.