Cisco IP Business Phone 8851, 5-inch WVGA Colour Display, Gigabit Ethernet Switch, Class 4 PoE, USB Port, 10 SIP Registrations, 1-Year Limited Hardware Warranty (CP-8851-K9=). Product type: IP Phone, Product colour: Black, Handset type: Wired handset. Volume control: Digital. Display diagonal: 12.7 cm (5"), Display resolution: 800 x 480 pixels. Voice codecs: G.711a, G.722, G.729A, iLBC. Bluetooth version: 3.0+HS, Supported network protocols: SIP, SPD, UDP, GARP, DNS, TFTP, HTTPS, VLAN, RTP, RTCP, PPDP, Security algorithms: EAP-FAST, EAP-TLS, HTTPS, SIPS, SSH, SSL/TLS