Please add chat permission:
If it's enabled, user can talk in a voice chat. Otherwise user is muted.
In apps it would be useful for chat owners - they will be able to create voice chat for admins only (via chat permissions) or restrict some people to
listen only mode.
Also don't forget to add it to Bot API (e.g.
ChatPermissions.can_talk). For bot's also will be useful. E.g. @TrueMafiaBot will be able to mute dead mafia players.