Screen : Large pixel-based display Lines : 2 Networking : Two-port Ethernet switch allows for a direct connection to a 10/100BASE-T Ethernet network Voice Codecs : G.711 and G.729a audio compression Network Features : Signaling protocol support : Session Initiated Protocol (SIP), Media Gateway Control Protocol (MGCP) and Cisco Unified CallManager Skinny Client Control Protocol (SCCP), H.323 and Microsoft NetMeeting compatibility Features : 24+ user-adjustable ring tones, Extensible Markup Language (XML) Power Supply : 48 VDC required, supplied locally at the desktop using an optional AC-to-DC power supply Dimensions : 20.32 x 26.67 x 15.24 cm Weight : 1.6 kg