Cisco 1-Line IP Telephone, 1-Port Ethernet, Display. Management protocols: HTTPS, HTTP, TFTP. Voice codecs: G.711, G.726, G.729A, G.723.1, Networking features: Ethernet/Fast Ethernet, Supported network protocols: IPv4, ARP, DNS, DHCP, ICMP, TCP, UDP, RTP, RTCP, TOS, SNTP, SIPv2. Display: LCD, Display resolution: 128 x 64 pixels. Weight: 975 g, Dimensions (WxDxH): 195 x 180 x 160 mm. Operating temperature range (T-T): 5 - 45 °C, Storage temperature range (T-T): -25 - 85 °C, Operating relative humidity range: 10 - 90 %