[8FS_Bulau]

You select a channel to use in the chat window, when you are in the game. If you enter a "." (period) into the chat box, a list of channels appears below the chatbox. Select the desired channel with the UP and DOWN arrows, or enter the channel number. You can hear anybody in the same channel you are in.

But, as I said...nobody uses it, so who do you expect to hear?