However different municipalities define trespass in different ways. Here is the one from Tulsa:
It is my interpretation that if you carry a firearm past a gunbuster sign in Tulsa and are in violation of item A since you have entered the property without the owner's consent (they don't want you carrying and you are).Originally Posted by Tulsa trespassing code
As such, you are then trespassing and could be arrested without notice.
Again, this is my personal opinion and everyone in their dog will argue that I am wrong because somewhere this "you have to be asked first" stuff became gospel as the only means for being charged with trespass.
From what I understand the guy that had a ND in the medical center in Tulsa was charged with trespassing and he was not asked to leave.