The 1st number will most likely be on the red/green pair. The 2nd number on the yellow/black pair. If the wiring is fairly new the 1st pair will be white/blue and the second will be white/orange. In most cases just reverse the connections in the jack. The jacks are wired: Line 1 green/red Line 2 yellow/black Swap the wires that are connected to yellow/black with the wires connected to green/red.