Echo Calls 80002: Echo Boss Calls is our competition call for the World Championship Duck Calling Contest in Stuttgart Arkansas. They are tuned specifically for the competitor. When competing, our calls have back pressure to allow you to blow the required number of notes for extended hail calls. It transitions well from lower to higher notes, enabling the caller fewer mistakes. The success of the Echo Competition Call speaks for itself with over 200 sanctioned titles, including every category of the World Championship.