http://www.splashdamage.com/forums/showthread.php?p=367584#post367584
Please post in that thread over in the server support forum showing YOUR desire to have voip turned on. New server admins often don’t realize VOIP is disabled by default, and only works with fireteams. By letting admins know you support global voip, we can have more communication and better games across the community.
Let’s repair Splash Damage’s mistake ourselves - the option is there if the community strongly supports it and communicates it. Tons of admins have no idea you can even turn it on - let’s get that message out. Keep the post linked above bumped and show your support by replying.