This document from Callcum Technologies describes how an interactive voice response (IVR) system works and lists some of its applications. An IVR system can handle large call volumes, provide service outside of regular hours, and enhance customer support while reducing costs. It allows automated call processes including setting welcome messages, assigning call rights to departments, call forwarding, and recording calls. Some potential uses of an IVR system include complaint management, sales lead management, surveys, ticket and taxi booking, and disaster alerts.