Screen : 5-inches 800 Χ 480 resolution, grayscale display Lines : 5 Networking : 2-port Cisco Ethernet switch allows for a direct connection to a 10/100/1000BASE-T Ethernet network Voice Codecs : G.711a-law and mu-law, G.722, G.729a, Internet Low Bitrate Codec (iLBC), and Internet Speech Audio Codec (iSAC) Network Features : Session Initiation Protocol (SIP), Session Description Protocol (SDP), UDP, DHCP, GARP Signaling protocol support : Session Initiation Protocol (SIP), IPv4 and IPv6, Features : The phone offers an easy-to-use interface and provides a traditional telephony-like user experience, Wideband for enhanced audio clarity, Line keys, Soft keys, Four-way navigation keys Power Supply : IEEE Power over Ethernet class 2, Cisco IP Phone Power Cube 4 Dimensions : 229.1 x 257.34 x 40 mm Weight : 1.17 kg