Sounds like you are having a problem with the generated ring signal from the cable phone service. An old fashioned Ma-Bell ring signal is a pure 90v AC 30hz pulse. Your cable box needs to generate a simulated ring signal from a DC power supply. I have seen many examples of this fake ring signal not cooperating with specific phones. It's a long shot but your phones MAY have a setting for the phone line(s) (A/B) (Analog/Digital) etc... of you can find a setting dealing with the "CO line", "phone line" etc.. try changing it. I am surprised another phone in the loop will help the ring signal at all. I would think it could only weaken it. Try plugging your phone in question directly into the cable line instead of having the whole house connected. The ring signal may be trying to power too many devices or weakened by something connected to the network. Other than that, you are dealing with the ring signal generated by the equipment and I'm sure it's not adjustable.
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