[Adam]

I don't understand why you need more. It's pretty clear. By "calls," it's referring to the preliminary signals. On top of that, the voices of experience here (I'm not counting myself among those voices, BTW) say the same thing. The voices of experience in my local association say the same thing. Even though a lot of officials ignore the rule and do it their own way only to laugh later, I've never heard one indicate they thought the rule was different than we've stated here.