Cisco SPA 301. Voice codecs: G.711, G.722, G.726. Supported network protocols: IPv4, ARP, DNS, DHCP, ICMP, TCP, UDP, RTP, RTCP, TOS, SNTP, SIPv2. Security algorithms supported: 256-bit WEP, HTTPS. Dimensions (WxDxH): 194 x 45 x 97 mm, Weight: 0.771 kg. Certification: FCC,UL, CE, A-Tick, Compliance industry standards: IEEE 802.3