I have an old phone system with a NT5B01 KSU and M7310 phones. I don't have any information about programming the phone system other than setting up speed dial keys, etc.
Specifically, I want to change what lines are used when a handset is lifted. For example, the system picks up line 2 first and, if engaged, picks up line 1.
Can anyone tell me how to change the line configuration to choose line1 first, then line 2? Or, can anyone point me to a manual on the system?