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Oh sorry, yes I've tried both but there is always that buzz. If you send me how you would set it (which wire colour in which number slot + toggle switches) I will try again and let you know. Much appreciated

Don't have a clue what you are talking about

Yes both volumes to lowest setting but still ridiculous buzzing noise. Concertion table came with the box. This is how I worked out which wire goes where. On the left old handset terminals and colours, on the right new handset terminals and colours (4 white and green) still no joy

Hi there, is this I've got not compatible???

Hi guys first post here. I am in the middle of a major renovation of my flat and wanted to swap the intercom with a newer and smarter looking one. The old model is Videx smart 1 and would like to replace with fermax loft 3399. I have tried to follow the wiring diagrams and it actually works...