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It is impossible to make anything foolproof, because fools are so damned ingenious.
So Comcast sends me a new modem to install which controls my internet access and VOIP.
Being in an earthquake zone I know the hard way that when they strike about the only thing left working is the landline as once the electricity goes offline, so does your routers, modems and VOIP phones unless you have a UPS on all that gear, which I have.