DRT Call. Our Acrylic Echo DRT(Double Reed Timber) Duck Call is Echo's newest Double Reed Timber call. Great for medium to close up calling. Ducky tone yet, easy to operate for beginners or seasoned hunters. This call is great for the hunter looking to start calling. If you're new to calling and plan to hunt in the timber then this is the call we recommend for you. The DRT is great for a finishing call because it can get extremely quiet. Works great even in late season hunting when ducks are more skittish.