Welcome to the Emergency Services Telecommunications Authority (ESTA). ......a world class multi-agency emergency call taking and dispatch communication service. Where is it? What is it?: The most important information you can provide. Triple Zero Heroes: The program, which aired last season on Channel Seven (08/02/09 to 29/03/09), featured ESTA's calltakers in some heart-wrenching stories from Victoria.Junior Triple Zero Heroes 2008: The kids who call Triple Zero to get help in an emergency.