dry loop DSL, ooma hub, and in-house phone 2-pair wiring
However there is no details explaining how this should be done, so today I did some research on the phone wiring:
wikipedia link on RJ14(2-line) color code - line1: green(pin3),red(pin4); line2: black(pin2),yellow(pin5)
Photos below show the NID wiring outside of the house. There are two lines coming out of the customer side(the 2nd half-ringer) and both have their line1(green and red) connected.
"Converting a "Line 1" jack to a "Line 2" jack " section:
"Note that black is swapped for green, and yellow is swapped for red. Of course, it would also work if you consistently swapped the black and yellow wires the other way (black for red, yellow for green) but that is not the standard. Given that you have to be consistent between the two ends of the wire, you might as well follow the standard. "
My plan is as below: