Extend Inverter Remote with Phone Cord?

Merry Xmas everyone. So the question is if the inverter remote on/off is on one of those phone line looking cords with the same sort of jack but is too short, how can you add phone line to make it long enough?

I have read here that the wires in the remote's line are reversed from phone ones. ? You can buy end to end connectors for phone line but how can you use those for this? Or what?

Thanks.