Cisco IP Business Phone 8811, 5-inch Greyscale Display, Gigabit Ethernet Switch, Class 2 PoE, 10 SIP Registrations, 1-Year Limited Hardware Warranty (CP-8811-K9=). Product type: IP Phone, Product colour: Black, Handset type: Wired handset. Display: LCD, Display resolution: 800 x 480 pixels. Voice codecs: G.711a, G.722, G.729A, Ringer type: Polyphonic. Supported network protocols: SIP, SPD, UDP, GARP, DNS, TFTP, HTTPS, VLAN, RTP, RTCP, PPDP,, Security algorithms: EAP-FAST, EAP-TLS, HTTPS, SRTP, SSH, SSL/TLS, Networking standards: IEEE 802.1Q, IEEE 802.1x, IEEE 802.3ab, IEEE 802.3af, IEEE 802.3at, IEEE 802.3i, IEEE 802.3u. Width: 257.3 mm, Depth: 40 mm, Height: 229.1 mm