The bird I had close today wouldn't walk around a briar bush even though he'd done it a few minutes before I got there based on the location of his gobbles. They are odd creatures.
Best piece of advice I've ever received came from Joe: "Call because they want you to call, not because you've been calling." I do WAY less calling these days and it seems to be more effective. I'm still a newbie since I picked this up late in life and coaching baseball made it tough to hunt much. However I've seen the silent treatment keep them staying vocal and as long as they are talking, you have a chance.