We never put a UPS on the systems. We only put batteries on them - 4x 12v 7AH batteries are WAY CHEAP. We've found they can run a system 18 hours depending on call loads (and POE - this was with no POE IP sets). Batteries are what, 12$ each? if that. Anyway, less than 100$, and a cheap UPS runs about the same but gives you maybe an hour of run time. Good surge supressor and batteries beats a UPS...

~ Marty

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