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I am connecting a 1950s vintage phone the wire only holds 3 internal colors red green and yellow. The wall jack has red green yellow and black. I hooked up the colors except black. The phone works...

Im trying to hook up a vintage phone the wite to the phone only has a red,yellow,and green connect.The wires from the wall have a red,yellow,green and black. I hooked up the colors to match except...