thanks a lot to all! especially to Four Seven Eleven and Draculas Teabag!
some of my workmates did use CPDLC on pacific ocean route, but then we were informed that wasn`t authorised, because we are not trained to do that. but recentlly, on the australian route, we are asked to use CPDLC, and lots of us are using. so i am really wondering if we need authority and training or not!