i have a facing this problem, when put a phone in CFA, i see the signal that is in forward to other DN, when we call to that have CFA, receive a busy tone.
I.e. DN 1000, 2000 and 3000
Put CFA 2000 to 3000
1000 calls 2000 and get busy tone.
I check CSS & partition, is fine.
I try to remove and put again the 2000, put in another model phone ( 7960 and 7912 ) but nothing change.
Its strange! because all call are internal's