Originally Posted by Avles
That's interesting-- to me it seems inconsistent with the rule that a player is responsible for calling "not up" on himself, as that seems like a pretty analogous situation. What's the justification for the difference?
I think the difference is that the code also says that you are responsible for calling balls that land on or are aimed at your side of the court. Which is great for a not-up, but since once you hit the ball, it is traveling to the other side of the court, so it's the opponent's call.