Innovative network controlled school bell, paging, emergency notification, and intercom system that is used by hundreds of schools, factories, and businesses. BellCommander's audio scheduler is ideal for factory and school bells with support for unlimited day schedules, multiple zones, and over 200 events per day. Audio can be played to networked PC's with the BellCommander client installed, to Barix network audio devices, and locally through the PC's sound card. Bells, sirens, lights, and intercoms with contact closures can also be controlled using external relay controllers. The external relay controller acts as a flexible and easy-to-use alternative to traditional electronic and mechanical timers. BellCommander can also be used as a paging and emergency notification system. Using a standard IP network, pages can be sent to networked PCs and to network audio players. Pages can be targeted to individual PCs or network audio players, to groups of clients, or to the entire system. Pages may be pre-recorded or broadcasted live from a PC microphone or SIP phone. BellCommander is used by hundreds of customers and has been features on CBS Radio and in many trade publications.