alt Hacker NewsIt is definitely a thing given a good perceptual metric. The metric even doesn't have to be very accurate if the distortion is highly bounded, like only altering the lowermost bit. It is unfortunate that most commonly used distortion metrics like PSNR are not really that, though.
But that's mathematically impossible, to restore signal from extremely low bitrate stream with any highly bounded distortion. Perhaps only if you have highly restricted set of posible input, which online meetings aren't.