I am doing something like this, though it is with conductive pipes and in the same world.
Playing a Tekkit SMP world, with a world anchor and Teleport Tether in the same chunk as the teleport pipes.
However, if I place 2 teleport pipes within the currently loaded chunks, they work just fine.
By the way, they cannot even connect to eachother when they are far away, it says "0 connected pipes".