The Absolute VOICE AV-400 is an executive level, full color internet phone with 5 Session Initation Protocol (SIP) accounts. read more… The Absolute VOICE AV-400 features industry standard Power over Ethernet, so no power cable or outlets required. It has a full duplex speakerphone, dual Ethernet Ports, three-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. User applications include: Call Parking, Find Me/Follow Me, Do Not Disturb, Conference Rooms, Call Forwarding, Time Conditions, Presence, Queues, Transfer to Voice Mail, and Log in/out.