CP-9951-C-K9= - Cisco 9951 Unified IP Phone Endpoint

1. Display: 5-inch (12.7 cm) widescreen VGA (640 x 480 pixel) color display
2. Ethernet Switch: 10/100/1000
3. Speakerphone: Full-duplex speakerphone with acoustic echo cancellation
4. Headset Port: RJ-9 jack
5. Protocol Support: SCCP and SIP
6. Power over Ethernet: IEEE 802.3af PoE (Class 3)
7. USB Ports: Two USB ports for media and storage applications
8. Security: Built-in security features such as Secure Real-Time Transport Protocol (SRTP) and Transport Layer Security (TLS)
9. Call Control Protocol: Skinny Client Control Protocol (SCCP) and Session Initiation Protocol (SIP)
10. Audio Codec: G.711a, G.711u, G.729a, G.729ab, Internet Low Bitrate Codec (iLBC), and Internet Speech Audio Codec (iSAC)
11. Dimensions (H x W x D): 8.5 x 10.5 x 1.5 in. (21.6 x 26.7 x 3.8 cm)
12. Weight: 3.5 lb (1.6 kg)

Helpful Notes:
1. The phone supports up to 2 Cisco Unified IP Phone Expansion Modules.
2. It has a built-in 2.5-mm jack for connecting a headset directly.
3. The phone can be wall-mounted using an optional wall-mount kit.