16kHz sample rate (= max frequency 8kHz) should be enough for speech only. Human voice is mostly <0.5kHz. You may hear some difference for hisses or for room so

16kHz sample rate (= max frequency 8kHz) should be enough for speech only. Human voice is mostly <0.5kHz. You may hear some difference for hisses or for room sounds etc. but I’m sure you’re unable to hear any difference to higher sample rate in a voice chat setting