Select configure by devices, then select the BCM model you have, it is a good tool that will allow you to input your own time requirements and what they recommend. Based on that result, you can search for a good Battery Back up that meets those requirements (meaning you dont have to buy the APC model, but a similiar one)
It doesn't clearly explain that, but I would think it is capacity, if you have 20 phones it would be low, 100 phones would be high i think. At least it sounds good!
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