Cisco SPA512G. Display: LCD, Display resolution: 128 x 64 pixels. Voice codecs: G.711, G.722, G.726, G.729A. Supported network protocols: IPv4, ARP, DNS, ICMP, TCP, UDP, RTP, RTCP, SNTP. Security algorithms supported: 256-bit AES, HTTPS, MD5. Input voltage: 100 - 240 V, Input frequency: 50/60 Hz