Screen : 396 x 162 pixel (3.5 in. / 89 mm) High-resolution, graphical grayscale display Lines : 4 Networking : Integrated IEEE 10/100/1000 switch Voice Codecs : G.711a/?, G.722, G.729a, iLBC Network Features : Cisco Discovery Protocol, Transparent secure roaming, Provisioning of network parameters through DHCP Signaling protocol support : Session Initiation Protocol (SIP) Features : Four line and programmable feature keys, Built-in speakerphone, Wideband for enhanced audio clarity Power Supply : The phone supports IEEE 802.3af PoE (Class 1), Cisco power cube 3 (CP-PWR-CUBE-3=) and Cisco power adapter 3 (CP-PWR-ADPT-3) Dimensions : 20.7 x 20.6 x 2.8 cm Weight : 867 g