The Absolute VOICE AV-275 is a great entry-level cloud based IP phone with 3 Session Initiation Protocol (SIP) accounts. It features industry standard PoE (Power over Ethernet), so no power cable or outlets are required. It has a full duplex speaker-phone, dual Ethernet Ports, five-way conference calling, high definition voice quality, and built in Virtual Private Network (VPN) capability. Users can now control complicated features directly from their phones -no need to remember feature codes. Applications driven by DSS keys include (but not limited to) busy lamp field, call park, do not disturb, call forward, call record, speed dial, multi-cast paging etc.