Woodwise Calls has at least 2 different bear calls and a real good video on calling them.If I were you,I would at least get the video.
Most people say you should call for a full hour at each location and bears keep coming when you call and stop when you do.
It is not uncommon here,for bears to come into cow calls when elk hunting.
The Fall is prime time to call as bears are seeking anything to eat that they can find-24/7.Keep your eyes open.
I haven't done a lot of calling but often thought one of those fawn decoys would be great to divert the bear's attention from your location.
Don't forget,lions may sneak in too.Keep your eyes open.
If you hunt in areas with grizzlies,it's not a good idea.