I've been using a Panasonic KX-TGE275 cordless phone since Jan 2015. Base unit, with built in answering machine, and 6 cordless handsets spread through out the house. The base unit will need to be plugged into the wall jack, with a cordless handset placed where you want it. The handset will indicate if there is a message recorded, and you can listen, save, and delete messages from any handset or the base unit. That, or something like it would give you what you want without any additional wiring needed.
I used to be wishy-washy, now I'm not so sure.
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