I have set up an incomming truk from a local TSP. Initialy, an incomming routing was defined to one of the extensios, which worked well.
I decided to experiment with the callback feature... now, whenever I call this truk, I get a busy signal. Reverting back to the old setting chaged nothing.... the line is still busy.
I do see the incomming call using the call monitor, where it's destination is maked as 's' (???).