Hello - can anyone help please. I want to replace a BPT 5 wire entryphone with a Comelit2608. The wiring points on the BPT are 1-2-3-C-4. 1=Common, 2=Speech Out, 3=Speech In and 4= Call (2 wires into same port) (C is not in use). The wiring points on the Comelit are L-L-CFP-CFP-P1-C1-S+ and S-. Can anyone please tell me what wire to connect to what port. With thanks