What's wrong with him?

So I enjoy gaming (like COD) and so does one of my buddies. We both have PCs so we like to skype each other so we can chat while gaming (especially online).

It's fun to have someone to talk to, but he recently started playing WoW again (we used to but boh quit a while ago). Recently when I call him and try to talk to him he seems to just ignore me... I'll be suggesting a game to him or telling him something that happened to me, and he'll say, "yea I didn't hear a word you said."

Which I know is bullcrap, because we on skype...

So it's gotten to the point where I just won't call him or even say anything because I know he'll just ignore me. I have to YELL at him a few times before he realises im talking to him. Does he have ADD or is he really that distracted by his game???