If you are using a digital phone service, like Xfinity, the easiest solution is to buy a set of cordless phones and connect the master phone to the modem. Then, use the other cordless phones in the other rooms. That way, you are bypassing the entire built-in phone wiring system. If you are using an actual analog phone service, you may want to consider switching to a digital service. It is cheaper and has many more calling features.
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