[USR-TC] Winmodem Connection Problem

We recently upgraded to the latest V.92 code and quickly determined that it did not work. We disabled V.92 but decided to keep the microcode at that release. However, now we're having trouble with almost all our 3Com Winmodem customers! Did 3Com not even test this microcode with their own modems or is there something I'm missing? All circuits are PRI Hiper DSP code 3.5.12 Hiper ARC code 5.3.2