If he is in shooting range I do not do anything to give my self away. If I know he can't see me I will try grunting just to get his attention maybe he will be curious enough to come check it out. Depending on the time of the season and if he is far enough away that I can see him and he can't see me I will try rattling very briefly, you have to keep your ears pinned and your eyes peeled though cause you never know if another deer is in the area. Just my opinion, I am sure there are several methods you can use, just have to find out what is best.