Hello. My name is Michael. I will be helping you with your question today.
The best way to prevent this, on the Ooma and on all your electronics that have volatile RAM is to have a basic battery backup. Usually, when residential power goes down, it's for a short period of time, so you don't need to spend a great deal of money on it (some battery backup systems can be expensive). Here is an example of what you would need for Oooma.
Just use that in place of a surge protector. It's a little bit more, but the size of this will keep a device like that running for days. This is about the smallest you can get, and the price is really good. If this isn't the solution that you are looking for, let me know and I will help until your question is fully answered.
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