Recently i received feedback from 1 of my customer on 2 ways audio features in FI8918W.
at 1st, he was complaining on 2 ways audio having interference between mic & speaker.
suspected too near for speaker & mic on camera.
Finally when he use an external mic on his laptop, then problem solved.
& he conclude that the interference is due to mic & speakers on the laptop itself,
& not from the camera.
please do try yourselves.