So we have a NEC SV9100 here. A few times a season I get a report that an Analog line is randomly calling the wrong extension. When I investigate I find that the phone will start dialing another line after 2 buttons are pushed, whereas we use 4 digit extension here. It is not random for instance...
We have since taken the ground off to test. We have even had major power events since doing this. So far no damage to this new CPU card. We are guessing it IS a voltage to ground problem. This building our phone system is in is very old. We suspect the grounds are bonded in a way that makes it...
So we have the high voltage that feeds our substation get hit with lightning one night. The building our phone system is in has a dedicated back up generator. The phone system is also behind a large UPS. Somehow this outage blew our CPU card in our sv9100. We called our service campany for the...
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