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You'll never have a bull not know exactly where your last call came from. Call and move is the only way to fix that. If I can't move, then I can't call from there.
I call and move. As others have said they can pin point your location. A bull will come in and hang up where he thinks he should be seeing an elk. If you call and move "Quietly" you will have a better opportunity as the bull will be looking at the location of where you were. If you make noise while moving that bull has that location as the location of where he should be seeing an elk. Your other choice is being able to accurately shoot 70+ yards or more which would be the hang up spot.