Server customization, there is a shrieking/auto-kicking one too... No clue where they came from but assume they're just dayz scripts, you can prob. find them on here.
Makes me think we might want to make admin only VON over global an option for server hosts, and "global audio chat off" an option for players (although it already is but most don't realise, VON volume set to zero only affects global side chat audio, not direct, group, or vehicle.)