I don't know if VOIP is required in the game.. what's "VOIP"? I mean I know what VOIP is but I don't know what it means in terms of gaming... can't you already do that with a headset alone? It's a steam game not on console.
And I think the guy meant if their "base" is near the area.. not sure how much you watched but they spend a bit of time trying to find a hidden spot to store their stuff and sleep I guess. So they wouldn't want to disclose where they "live" lol hahahaha
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