I have two groups with BRI line in one group (group 1) and analog lines in the other group (group 2).
Main route
short code:8N
telephone number:N
feature: Dial
line group: 1
Alternate route
short code:8N
telephone number:N
feature: Dial
line group: 2
When the BRI line is busy, it should route the call over the other group, but on the phone is displayed only "disconnected" or something similar.