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thanks for you reply serg, ill put the old handset back on and check the door station and bus cable, if it still doesn't work ill purchase the Bticino 344202 thanks again!

can anyone help me we have a door entry system, someone at the front door presses the buzzer, we can pick up the handset and talk, if we like them we can press the button and let them in, recently the audio hasn't been working, we cant hear them and they cant hear us, we thought the handset...