Gigaset C610 IP. Volume control: Digital. Phonebook capacity: 150 entries. Voice codecs: G.711, G.722, G.726, G.729, VoIP protocols: SIP, Supported network protocols: RTP, DHCP, NAT, HTTP. Display resolution: 128 x 160 pixels, Display number of colours: 0.065000 M, Display diagonal: 45.7 mm (1.8 "). Frequency band: 1880 - 1900 GHz, Networking standards: IEEE 802.3