Greetings Mingus,
WW2 Online is how I found this game also! Although it was quite a bit earlier since I had left to come here.
Anyhow, Voice or commonly referred to as VOX has 2 main modes: Channel and Range. To speak to those players on your country (cannot speak to enemy players within range) you can use the F12 key as the mic button. To speak to players that you specified in the "V" chat box, you can use "T" as the mic button.
Vox is limited to 4 seconds, if I recall correctly. So, if you are long winded like myself, let go the mic button after each sentence and depress again for the next sentence / phrase.
FAQ: Who do you wish to speak to? How do you do that?
I want to speak to a specific player (can even be enemy) Use the "/" key to bring up the chat text window. There you will see 5 divisions labeled 1, 2, 3, 4 and V. 1 thru 4 can be tuned for chat by right clicking the number and choosing from a drop down list:
Country (color green = all country team members can read);
Range (color purple = only country team members within range and Whoopi Goldberg can read);
*All (color white = any online player can read *except for in the Main Arena where it has been muted);
200 (color white 200 = manually tune to 200 by entering "200" into a chat box you can only then read and display chat to all online players);
Squad (color red = all members of a squad that you have joined can read);
Mission (color gold = you can read and display chat to players in the same "Pick-Up Mission" that you have joined);
V (vox channel also gold = This is where you can specify who you wish to speak to, your options are now limited to Personal Message = enter any gameID, including your own, into the chat box, Mission, Squad and any 3 digit number between 100 and 299 entered in the "V" chat box) If you enter a 3 digit number between 100 and 199 only team / country players can hear. If you enter a number between 200 and 299 anyone also tuned to that same channel will be able to hear even enemy.