The echoes are usually caused by the looping of recorded sound. This happens quite often when the devices are situated too close to each other. It is possible that your Baby Station is picking up the sound coming from the Parent Station.
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Please make sure that you place the Parent Station out of the Baby Station's hearing distance. After that, this issue should disappear.
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You can lower the microphone sensitivity within the app (Menu -> Settings -> Microphone sensitivity) and the output volume of your phone.