If you have an actual analog phone service, call your phone company, and they will repair any issue outside of your house.
If you are paying a cable TV service for a digital phone service, you only need to connect the phone jack on the back of the modem to any phone jack inside your house. That should allow you to use all of the phone jacks inside your house, because they are interconnected. The inside jacks don't need to be powered from outside the house.
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