It's not correct but it will work. My main concern would be if you are pumping broadband down the whole system. It's suprising how little it takes to make a router drop out. If you're running 3 pair telecoms cables one alternative would be to create a return loop down the same cable by joining 3 incoming wires at each position to 3 out going wires, the remaining wires would then be terminated at the plate to terminals 2,3 and 5. Most people don't realise that only 3 wires are required to make a telephone circuit work, in reality half the terminals on the back of a telephone outlet are redundant in a domestic telecoms circuit.