Screen : Backlit Pixel Based Display: 128 x 64 Monochrome Graphical Liquid, 5-inch color LCD (720 x 1280 pixel), 9:16 aspect ratio Lines : 1 Voice Line with Two Call Appearances Networking : Two Ethernet LAN Ports with Integrated Ethernet Switch - 100BaseT RJ-45 Voice Codecs : G.711, G.726, G.723.1 and G.729a audio compression Network Features : IEEE 802.3, IPv4, ARP, RTP, RTCP, DHCP, RFC 2475, VLAN tagging 802.1p/Q: Layer 2 quality of service (QoS), SNTP, DNS, I CMP, TCP, UDP Signaling protocol support : Yes Features : Dedicated illuminated buttons for: Audio mute on/off, Headset on/off, Speakerphone on/off. Volume Control Rocking Up/Down Knob Controls Handset, Headset, Speaker, Ringer. Standard 12-Button Dialing Pad. High Quality Handset and Cradle. Built-In High Quality Microphone and Speaker. Headset Jack - 2.5 millimeter. LED Test Function. Two Ethernet LAN Ports with Integrated Ethernet Switch - 100BaseT RJ-45. 802.3af Compliant Power over Ethernet (PoE). Four Way Rocking Directional Knob for Menu Navigation. Voice Mail Message Waiting Indicator Light. Voice Mail Message Retrieval Button. Dedicated Hold Button. Settings Button for Access to Feature, Set-up, and Configuration Menus. Power Supply : Supplied separately, model: PA-EU Dimensions : 195 x 160 x 180 mm Weight : 0.9752 kg