Attributes . (4) Contact Inputs and (2) Relay Outputs, Compatible with TMA (Telephone Management Application) Software, Embedded Browser for Web Page Configuration, Hearing Aid Compatible, Noise Canceling Microphone, Power Over Ethernet or Alternative 48V DC Supply, Proximity Detecting Hook Switch With No Moving Parts, Real Time Email Fault Reporting, RJ45 LAN or WAN Direct Connection, SIP Compatible, VoIP Handset, Volume Control Pushbutton . Names