My friend has a townhouse built around 2006. There are 5 BT phone jacks around the house and appears to be CAT5e or 6 cabling from the jacks (with only two wires used) to a central hub point. 

My assumption is that each of the cables goes from the BT jack to the hub but this doesn't seem to be the case. We have brought Ethernet RJ45 faceplates and have punched in all the wires as per the specifications and trying to use the existing cables to connect two rooms together.

When we test the wires at the hub end with a cable tester (one end plugged into the newly wired ethernet port in the room and one at the hub) it doesn't seem to be pinging back on any of the wires. Even more confusing, on one of the cables it pings back on wires 2,6,7,8 even though there is no remote tester plugged in.

Even more confusing again, there are 5 blue ethernet cables in the hub (which are the same colour as the cables at the jack end) as well as 5 black ethernet cables, all of which were joined with the blue cables (see picture).

Is anyone able to shed any light here? I assumed that this is some kind of hub and spoke configuration but the evidence doesn't appear to support this.