Cisco CP-7821-K9 | 7821 VoIP Phone

1. Display: 3.5-inch (396x162 pixels) white backlit grayscale display
2. Ethernet switch: 10/100/1000BASE-T Ethernet connection through RJ-45 interface
3. Protocol: SIP (Session Initiation Protocol)
4. PoE: IEEE 802.3af PoE (Power over Ethernet) Class 1.5, max 3.84W
5. Speakerphone: Full-duplex speakerphone with acoustic echo cancellation
6. Audio: Wideband audio (G.722) and narrowband audio (G.711, G.729a, G.729ab)
7. Headset support: RJ-9 headset jack, USB headset support with USB adapter
8. Call features: Hold, transfer, conference, call waiting, call history, voicemail, etc.
9. Security: Secure boot, secure firmware, encrypted configuration files, etc.
10. Dimensions: 8.2 x 7.5 x 6.1 inches (20.8 x 19.1 x 15.5 cm)
11. Weight: 2.1 lbs (0.95 kg)
12. Compatibility: Cisco Unified Communications Manager (UCM), Cisco Hosted Collaboration Solution (HCS), and third-party SIP call control platforms.

Notes:
1. The phone can be wall-mounted using the optional wall-mount kit.
2. The phone supports up to two Cisco Key Expansion Modules (KEMs) for additional line and feature keys.
3. The phone has a built-in Ethernet switch for connecting a computer to the network through the phone.