Cisco 6821 2-Line IP Phone (3PCC) — CP-6821-3PCC-K9

The Cisco 6821 (CP-6821-3PCC-K9) is a 2-line entry-level IP phone featuring a 2.5-inch LCD display and dual-port Ethernet connectivity in the 3PCC (Third-Party Call Control) variant. Designed for deployments on non-Cisco SIP UC platforms including Microsoft Teams, Zoom Phone, and BroadSoft, it delivers HD voice quality and enterprise phone features in a cost-effective form factor — ideal for basic user and common area phone deployments on third-party SIP platforms.

Key Features

• 3PCC (Third-Party Call Control): Compatible with non-Cisco SIP UC platforms
• 2 Lines: Basic line capacity for standard user deployments
• 2.5-inch LCD: Clear display for call management
• HD Voice: Wideband audio for clear call quality
• Dual-Port Ethernet: PC passthrough for single-cable desk deployment
• PoE Powered: IEEE 802.3af — no separate power adapter required

Technical Specifications

• Part Number: CP-6821-3PCC-K9
• Lines: 2
• Display: 2.5-inch LCD
• Ethernet: 2x RJ-45 (LAN + PC passthrough)
• Power: IEEE 802.3af PoE or AC adapter
• Audio: HD Voice wideband
• Protocol: SIP (3PCC — third-party call control)

Use Cases

• Microsoft Teams: SIP-based Teams deployment via gateway
• Zoom Phone: SIP endpoint for Zoom Phone deployments
• BroadSoft/BroadWorks: Standard SIP endpoint for BroadWorks platforms
• Common Area Phones: Cost-effective endpoint for lobbies and shared spaces

Compatibility Notes

• 3PCC variant — compatible with third-party SIP UC platforms (not Cisco CUCM native)
• For Cisco CUCM deployments, use CP-6821-K9 (MPP/CUCM variant)
• Requires IEEE 802.3af PoE switch or AC power adapter
• Dual Ethernet ports support PC passthrough for single-cable desk deployment

Frequently Asked Questions

What is the difference between 3PCC and MPP variants?

3PCC (Third-Party Call Control) is designed for non-Cisco SIP platforms. MPP (Multiplatform Phone) is Cisco's term for the same — both refer to SIP phones for third-party UC platforms, not Cisco CUCM.

Is the CP-6821-3PCC-K9 compatible with Cisco CUCM?

No — the 3PCC variant is designed for third-party SIP platforms. For Cisco CUCM, use the CP-6821-K9 variant.

Does the 6821 support PoE?

Yes — the Cisco 6821 is powered via IEEE 802.3af PoE from a PoE-capable switch, eliminating the need for a separate power adapter.

Product Details

• Part Number: CP-6821-3PCC-K9
• Manufacturer: Cisco Systems
• Model: 6821 (3PCC)
• Product Type: SIP IP Phone (Third-Party Call Control)

Whether you are deploying Cisco 6821 phones on Zoom Phone, BroadWorks, or a third-party SIP platform, the CP-6821-3PCC-K9 delivers the HD voice, dual Ethernet, and SIP compatibility your third-party UC deployment demands.