Found this particular driver at www.aceex.com.tw on 20th Dec 2000. The other ones on the driverguide site up until now caused a BSOD on win2000.
We didn't know this was an isdn modem until we looked up the winbond chip number!
The driver is for a passive pci isdn modem and might sort your problems out.
BTW Win2000 finds it as a network controller but that is par for the course.
The following files are found inside the driver download file.
|WB692N2K.INF||4.4 KB||27 Nov 2000|
|LOOP2000.EXE||144.4 KB||7 Apr 2000|
|WB692PCI.SYS||132.2 KB||24 Nov 2000|
|CAPI2032.DLL||50.7 KB||24 Nov 2000|