Like newbielink:http://easternfront.org/forums/index.php?topic=1728.msg20095#msg20095 [nonactive], the Push to Talk function of Teamspeak 2 doesn't work in Eastern Fronts although it's fully available in normal CoH.
I tested with the "F4"-Button and a "MouseButton", both don't usable ingame...
When I tabbed out of the game push to talk worked fine.
And while hitting push to talk and tabbing back into the game the talk-function is switched on all the time...
Sorry for my bad english.