Then you need to find the telephone line connection between the ringer and the amplifier and check the connection as well. If these connections fail, the ringing sound will not be output. This is because the sensitivity of the microphone or amplifier is not good enough and requires external corrective elements to function. In this case, you need to remove the batteries and reconnect the circuit again. Then replace the batteries and try again https://sonneriefrance.com/les-dernieres-sonneries