The Enterprise Communications Server (or ECS), built by Iwatsu Voice Networks is the switching core of our Business Telephone Solution. This flexible switching platform is a converged IP system supporting SIP, local or hosted VoIP, TDM and Unified Communications configurations. Building on over 70 years of telecom experience, the ECS has an industry leading MTBF (Mean Time Between Failure), perpetual system architecture and operates with a 99.999% up-time.