In-Game Voice Chat

I was thinking since this game is similar to CS, why don't we have in game voice chat?
I heard Chinese CF already has this. This would make every game mode much easier when teamwork is vital to win, instead of typing. ''He's going B'' while playing, why not just say it and save time and maybe save yourself from getting shot while you're typing?
However I understand there's radio messages but sometimes they're not enough to communicate in game other than type.

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