The office has an old PBX system on the wall near the 66 B block. I need to disconnect and discard the PBX box and hook the internal lines directly to the B block. There are four lines installed on the block. The PBX has 9 four pair wires punched down on the right side of the block -the internal lines are punched down on the left side. Do I just need to install bridge clips and pull the four pair lines off the block?