Draytek miniVigor128 Quick Reference Manual page 24

Installing USB, CAPI 2.0, NDISWAN & Virtual Com Port
Drivers on Windows 98/Me
If you want to install as COM3/4, please select "One of the
other drivers" and click "View List" to select "DrayTek mini
ISDN TA for Win98/Me (COM3/4)".
(3) ISDN Configuration
After installing USB driver, it will install NDISWAN driver
automatically. You will find the ISDN Configuration screen as
following dialogue:
Press Next->Next
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For Windows Users