The document describes an IP-based public address system for a school with 150 classrooms. It includes an IP server software, remote paging microphone, 121 IP amplifiers to connect speakers in each classroom, and a CD/MP3 player. The system allows for online streaming of music and announcements to different zones. It has a capacity of 600 zones and 200 microphones, with amplifiers connected over the school's LAN network to provide audio to classrooms.