Draytek miniVigor128 Quick Reference Manual page 36

Connect 128Kbps/using NDISWAN
In "Device Name" of "Mutlilink", select the unused
NDISWAN device, e.g. "DrayTek NDISWAN-Line 02". In
the field "Phone Number" enter the same number as already
used for the connection setup.
For Windows 2000
On "General" dialogue:
Check both " ISDN channel-DrayTek NDISWAN" .
Then, you will be able to make connection at 128Kbps!
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For Windows Users