yes, all the linesmen can infact advise the ref as they are all connected to head sets but the ref makes the ultimate call, and the linesmen usually keep their pie holes shut in order to keep the game going.. giving them the ability to call a play down would put a stop to the dives and shameful plays of some of these guys. i think the reason they dont do it is cause then they would have to worry about the linesmen and the refs taking money to fix games lol.