To this day I still have this problem. I have a Nokia 7.1 android 10 handset and I have tried factory resets, changing ringtones to default, resetting lord knows how many times but am still unable to speak to anyone at the front door but I can hear them. Since my original post in January we’ve installed cameras in the house with the same two way speak facilty but have the same problem. I have to accept it must be a handset issue. My wife recently got a new samsung with android 9 and it works fine. I will not change my Nokia as I only got it last year and for everything else I love the handset. To sort the communication problem my wifes son gave me an old HTC android 6 handset and guess what?? The two way communication works fine. Maybe it’s an android 10 issue, who knows…