I moved into a house built in the 1950s in the north eastern US and this outlet is on the back of the house but I can't find anything like it searching online. If anyone knows what it is I'd greatly appreciate the enlightenment!

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[–] 2 points 2 days ago

They made adaptors from what you've got to rj11.

https://youtu.be/bTQQ5idTDjo

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