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I can confirm the four prong. My father installed phones. Had support for two lines black and yellow wires and red and green wires. Two wires per phone.
by orionblastar 8y ago
I can confirm the four prong. My father installed phones. Had support for two lines black and yellow wires and red and green wires. Two wires per phone.
- icedchai 8y agoYep, can also confirm. My parents have a four-prong to RJ-11 adapter in their house, built in the 60's.