You mean, after you have been assigned a trip, right?

Or are you just talking about sitting at home, waiting for a trip? Short call is not considered "Duty", nor is it "Rest", so once you get a trip, no, you are not required to go past the max duty day listed on the rotation, plus 2.

BUT...you also have to be able to look at your release time of that rotation, look back 24 hours, and be able to find 8 hours of "Rest", of which your short call time is not considered as "Rest".