is it possible to define a rule for call forwarding depending on the line state? For example: if secretary 1 is busy I must forward the calls to secretary 2. If secretary 2 is busy too, I must forward the calls to the attendant. The same rules I must apply for calls to secretary 2 (forward busy to secretary 1, if busy forward to attendant).
We are using CUCM 6.0(1). I've seen in unity there's a rulebased routing feature, but I don't know if it works in this case.