We set up call in D-I-D lines for each dept. in our factory. Employee's call their designated phone number which rings on a phone and a buzzer in the area. If no one picks up the caller leaves a message or presses zero for another dept. We don't have a big light but that might not be a bad idea. I just have supervisor in charge of checking these phones through the night.

To Succeed in life, you need three things: a wishbone, a backbone and a funnybone. ..Reba McEntire