I would like to know exactly which is the departure terminal of Ethiopian Airlines (ET) at PEK? T2 or T3?

I heard some people say T2 and others say T3! Last time I traveled with ET from PEK to ADD the departure terminal was T2 but when I came back with ET from ADD to PEK the destination (arrival) was T3, but worse enough my friends are travelling 2013.07.12 with ET from PEK to ADD I saw their tickets it indicated T3. I am also plan to travel soon therefore I am confused which terminal? Please give correct answer