Draytek Vigor2000 User Manual page 98

maximum number of active clients is also 2.
4. Before you set up the Virtual TA, you must set the
correct country code. Click "ISDN Setup" in the Basic
Setup group.
As the following application chart shows, the Virtual TA client can
make an outgoing call or accept an incoming call to/from a peer FAX
machine or ISDN TA etc.
Virtual TA Application
6-3