The Cisco 7821 is a two-line IP phone from the Cisco 7800 series for small businesses. The 7821 is easy to set up with PoE capability, EHS headset support, and a 3.5" white backlit display with 4 context-sensitive soft keys. It includes a 2-way navigation button and dedicated fixed keys for commonly used office call needs like conference, messaging, and directory. Full wideband audio (G.722) supplies superior voice quality performance through the handset, speakerphone, and third-party headsets. It has added an electronic hookswitch control for flexibility in managing calls and extending mobility around the office.

The 7821 can be PoE or powered by an AC power adapter, and desk mount or wall mount functionality allows this IP phone to be used for many business environments. A Cisco standard 1-year replacement warranty covers the Cisco IP phone 7800 series. It requires a Basic User Connect License (UCL) to connect to Cisco Unified Communications Manager.

• Power over Ethernet or AC power
• Signaling protocol support SIP
• Codec support G.711a/μ, G.722, G.729ab, iLBC
• identifies incoming messages and categorizes them for users on the screen
• 10/100BASE-T Ethernet connection through two RJ-45 ports
• supports CDP and 802.1Q/p standards, and can be configured with an 801.1Q VLAN header containing the VLAN ID overrides configured by the Admin VLAN ID