I don't know. Maybe the radios are using the "phone call" feature to relay the audio. Maybe they have to, in order for the mic to work if you transmit, without

I don't know. Maybe the radios are using the "phone call" feature to relay the audio. Maybe they have to, in order for the mic to work if you transmit, without delay. I've not tried transmitting, because listening is so bad, thanks to this feature.