In my 7940 IP Phones , I need the max line to be 4, but the phone should give busy trigger when one call is active.
I tried by changing the Max line to 4 and the busy trigger to be 1. After doing this, I am getting a busy tone when I have an active call, but the phone is not able to view the incoming call.
I want the phone also able to receive and view the incoming call in the phone display, but at the sametime need to send busy mesage to the caller.
How to acheive this?