Ipogolf66
Digital station voltage is 48 Volts, On 64xx phones, or 44xx phones, ringing, idle, onhook, offhook, always 48V! 48V was the Magic number on digital sets on definity, Merlin ( ATL/MLX/ISDN ).
PG is right, It isnt the software!
Usuall culprit for bunred out mods is lack of IROBs on out of building sets, ariel cables, or poor ground!
I would dould check the UPS, it could be working, but alowing spikes to go through the AC line!