CP-7821-K9 Cisco IP Phone

Cisco CP-7821-K9 - IP Phone 7821 Overview

The Cisco IP Phone 7821 sits just above the entry-level 7811 in the 7800 Series lineup. It adds a second line, a backlit display, and more user-friendly features, making it a strong fit for everyday office users who need reliable, secure voice communications without the cost of higher-end models.

🔧 Key Specifications

• Lines Supported: 2 lines (vs. 1 line on the 7811)
• Display:
  • 3.5-inch (384x106 pixel) grayscale display
  • Backlit for better visibility in low-light environments
• Audio:
  • Wideband audio (G.722 codec support)
  • Full-duplex speakerphone
  • Optional wideband handset/headset
• Connectivity:
  • 2x 10/100 Ethernet ports (switch + PC passthrough)
  • Power over Ethernet (PoE) Class 1 support
  • Optional external power adapter if PoE not available
• User Interface:
  • Dedicated fixed keys (hold, transfer, conference, voicemail, etc.)
  • Four-way navigation cluster
• Security:
  • Secure boot and image authentication
  • Device authentication and signaling/media encryption
• Deployment Options:
  • Cisco Unified Communications Manager
  • Cisco Hosted Collaboration Solution (HCS)
  • Cisco Webex Calling
  • Third-party call control (with multiplatform firmware option)

🧩 Ideal Use Cases

• Office workers and managers with light-to-moderate call volumes
• Shared workspaces where two lines are useful (e.g., personal + departmental line)
• Cost-sensitive deployments that still require enterprise-grade security and reliability
• Organizations standardizing on Cisco Unified Communications or Webex Calling