Have a customer who added a 3rd line to a 50. The line rings in on the button and can be answered, but it can not be seized by pressing the button to make a call out (fast busy). The idle display shows two rectangle block in the LCD. All 12 button phones, default administrator password works, but installer password does not. Customer does not know what the password might be, and I didn't sell this to him. My assumption is the 3rd line is set up as inbound only, but that won't do. Any suggestions? Starting from scratch is probably an option, as there are only 5 sets and 3 lines.

Mike