Firstly, I don't know much about Unix so please bear with me.
I have a server system running SCO, not sure what ver. it is running Rinax software. The computer is a P-166. It has dumb terminals connected to it throughout a supply store. As of late, for some reason, when the fax machine rang the computer seemed to lose power. It would have to be shut off then turned on again.
The fax machine was moved into another room and that seemed to help. The other day though it rebooted itself for some reason.
Now the computer has a modem in it, but it and the fax machine are on two seperate phone lines. The computer has a UPS on it. Can't think of any other details that may help.