“Do you have to replace all the phonesin your house to make the robo call blocker work?”
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Not the corded or wall-mounted ones. However, they will ring once when any call comes in, even if the call is blocked or filtered. If the caller is in your directory or allow list, the corded or wall-mounted phones will ring until the call is answered or canceled from the base unit or a cordless handset. If you have another cordless base unit, I have no idea if it would work without interference with this unit.
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