Nope. But not sure if that boss really requires it. I mean, perhaps it does, but we didn't last significantly long and voice communication wouldn't have made a difference.
Like vorago, it's another boss of communication. Talking makes it much easier to tell people who to kill, where to go and so on rather than pressing enter and then typing it all out. >.<
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You don't need that much communication if everyone knows what they are doing but it would help a lot if you can plan strategies in real time to be more efficient instead of acting based on predefined instructions like a bot. The only exception may be the timing with the kills, which has to be very precise as well and you can't really know when to actually start finishing without communication with the other side.
Hi