We have a two line rotary phone. Lately if one line is in use an incoming call should ring the next open line but instead gives a busy signal.
SOURCE: line 4 doesn't ring in coming call
The way 4 line phones work is that you need 4 lines on every jack that is connected to your phone.
You see the light probably because one of the phones has line conected and you see line appearance.
SOURCE: How to add a second lint to Nortel Phone System???
So what, exactly, is your question? Physically, you order a second line in a "hunt" group, and plug or wire it into the system cabinet. By default, a Nortel system has 2 lines already programmed to the sets, but you will probably need to activate the second line appearance in programming.
Carl
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