If the birds are still on the roost i will do a soft tree yelp and be quiet until flydown time. Then I will do a flydown cackle. If I get a good response I' ll start with some excited yelps. Every situation is different but this is the normal start to my day.
I only call enough to keep[ the gobbler coming. If he is with hens i will try to make the hens mad by mixing some cutts with the yelps. If you hear the hens getting excited. Try to copy them but increase the volume. I have pulled in several hens this way with a gobbler in tow.[:-]