I think this would be cool, and also help reduce chatter in the game if there are a lot of people with VoIP.
There are different divisons, Armored Division, Infantry Division, ect and each of those divisions each are able to chat with each other by default over VoIP. However they would be able to talk to the entire team with the press of a button.
So when your an infantry, you hear people talking in the infantry division, when you enter a vehicle, you hear people talking in the armored division.
Just an idea I thought of that could/could not help. I thought it be cool, but it isn't important. Is it even possible to make?