ESChat is the leading solution for secure broadband Push-to-Talk (PTT) services. ESChat operates on and across all wireless carriers, providing inter-carrier interoperability. ESChat is a FirstNet Certified™ solution and is also approved by the Defense Information Systems Agency (DISA) for U.S. military operational use. ESChat supports Quality of Service (QoS), Radio Access Network (RAN) Priority, and Preemption enhancements available to FirstNet subscribers, as well as QoS and RAN priority enhancements on the Verizon Wireless and AT&T commercial networks. In North America, ESChat is the primary PTT offering by T-Mobile and TELUS.