| ISDN Serial Port Modem(?)
If it is a serial port ISDN "Modem", then it probably disguises itself to the host computer as a Hayes-compatible analog modem, with all of ISDN protocol embedded in the box you attach to the serial port. Should work like any other serial port modem (especially as you said it did).
ISDN Terminal Equipment are BRI cards, and ISDN protocol is implemented either in the card logic, or in the host driver/stack. These ISDN cards are probably not supported, but it might be possible to port isdn netgraph nodes from FreeBSD.
Regards,
/Marino |