CyberData's new V3 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. This device now supports CISCO SRST. The SIP Office Ringer provides an audible ring indication (user-uploadable) when part of a ring group. The SIP Office Ringer also supports direct SIP voice paging and priority-based Multicast broadcasts. CyberData V3 SIP Office Ringer is one of many Phone Couplers, Adapters & Routers available through Office Depot. Made by CyberData.