Screen : Pixel-based display Lines : 1 Networking : 10/100BASE-T Ethernet connection through an RJ-45 interface for LAN connectivit Voice Codecs : G.711a, G.711u, and G.729ab audiocompression coders-decoders Network Features : IEEE 802.1Q /p VLAN tagging and traffic prioritization, Trivial File Transfer Protocol (TFTP) Signaling protocol support : Cisco Unified CallManager Version 3.3(2) and later, using the Skinny Client Control Protocol (SCCP) protocol, SIP Features : Calling name and number display, Three-way calling (conference), Four speed dials configurable Power Supply : Inline power. Power can also be supplied locally using an optional AC to 48-VDC power adapter Dimensions : 20.3 x 17.67 x 15.2 cm Weight : 0.9 kg