Depends what type of cabinets. csi, scc, mcc, and how many carriers. APC has all of the Avaya equipment available in it's selector / sizer. Try it below
I would check the power consumption of each device. For example: 700VA for each carriers and 300VA for each PC, together they consumpt 2000VA. Then I would buy a minimum 2KVA UPS.
Another factor that you need to consider is the duration of the UPS power, this has to do with batteries capacity. For a small UPS, you have no choice for capacity because the box limits what physical batteries you can install.
You may want to post the same question at the General UPS Discussion forum.
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