Need help with the Bellman & Symfon System, anyone got one?

I have just bought a light on to alert me to my mobile phone.

I can attach it to a Bellman and Symfon telephone transmitter. Inside you can change the signal freq to alert either the dummy, door, telephone and fire. Ive tried every combination but can’t get the telephone to light up. I can get all the others.

Is there anyone who has a 868 telephone transmitter that could look inside to see what combination it says for the signal eg 1 up and 2,3,4 down etc.

Thanks.