handset to fermax 3431 evo

Hi all! Trying to wire old BPT C/200 intercom handset to Fermax 3431 EVO and just can't make it work. Usee manual, but it doesn't work. Existing working Wires on BPT c/200 5 - green with white 7 - blue with white 8 - orange with white 9 - white with orange And new Fermax 3431 6 - green...