The SIP Paging 25V/70V +4 Amplifier is an analog/IP hybrid, cost-effective paging/intercom solution. It allows customers to use CyberData's or their existing 25V, 70V, constant voltage speakers, and/or CyberData multicast endpoints in a VoIP environment. The SIP Paging 25V/70V +4 Amplifier sends and receives multicast, including from any channel of Poly phones. The SIP Paging 25V/70V +4 Amplifier has a built-in calendar-based scheduler that enables scheduled bells and prerecorded messages to be sent to different multicast zones as well as four analog zones. Multiple analog zones can be supported by adding additional SIP Paging 25V/70V +4 Amplifiers. CyberData's SIP enabled VoIP products are compatible with a vast majority of VoIP systems including SBCs, Gateways, and phone systems both on-premise or cloud-based.