The Cyberdata V3 SIP Office Phone Ringer provides a loud attention getting audible ring for noisy locations or large coverage areas. The IP Office Ringer is easy to connect and plugs into any POE switch.. The SIP Phone Ringer also supports direct SIP voice paging and priority-based Multicast broadcasts when part of your IP paging network. The Cyberdata SIP-enabled IP Office Ringer is a Power-over-Ethernet (PoE 802.3af) and Voice-over-IP (VoIP) notification device that easily connects into existing local area networks (LANs) with a single cable connection. Standard night ringer function can be utilized as detailed in the Operation Guide.