“My cable modem also provides phone service (DT). I need therefore, to extend that dial tone to a phone that is located in a completely different room in my house. Will these work?”
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Wow, That's a good one. The answer is no. You are working with two different methods. Power line adapters are only used to extend the carrier (internet connection) signal across the power line. If you have a phone port that's where your phone should plug into RJ-11
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