I think there are in fact very very few occasions where anyone should be calling "got it".
Ball coming down the middle when two players are at net: Really no time to call for it in this situation. Player in front and/or with better angle always goes for it. This is a matter of feel not communication.
Lobs: Player being lobbed should either go for it (and keep quiet), or else call for help ("help" or "yours").
"Got it" makes sense in rare situations where for example both are back and opponent hits a drop volley short in the middle of the court. First player to react will call for it.