Cisco IP Phone 6851 Multiplatform SIP Phone CP-6851-3PCC-K9

Cisco IP Phone 6851 Multiplatform (CP-6851-3PCC-K9) — Refurbished with 10-Year Warranty

Save up to 70% over new with this professionally refurbished Cisco 6851 VoIP phone. The CP-6851-3PCC-K9 runs Multiplatform Firmware (MPP), making it fully compatible with third-party SIP platforms including BroadSoft, Asterisk, 3CX, Metaswitch, RingCentral, and other UCaaS providers. Every unit is rigorously tested and backed by Reef Telecom's industry-leading 10-year warranty.

Key Specifications

• 4 SIP Registrations — Support four simultaneous lines/accounts
• 3.5" Backlit Grayscale Display — High-resolution 396×162-pixel screen with white backlighting
• Dual Gigabit Ethernet Ports — 10/100/1000 with PC passthrough
• Power over Ethernet (PoE) — IEEE 802.3af Class 2, no separate power adapter needed
• HD Voice / Wideband Audio — G.722 codec with noise reduction for crystal-clear calls
• Programmable Line Keys — 4 fully customizable keys with tri-color LEDs
• Key Expansion Module Support — Add up to 28 additional function keys
• Full-Duplex Speakerphone — Hands-free conferencing and collaboration
• EHS Headset Support — Compatible with RJ-9 and Electronic Hook Switch headsets
• Energy Star Certified — Eco-friendly with power-save mode for off-hours

Ideal Use Cases

The Cisco 6851 3PCC is designed for small to large enterprises migrating from analog or digital phone systems to IP communications. Perfect for offices, reception desks, contact centers, and any environment running third-party SIP-based UCaaS platforms. Not compatible with Cisco Call Manager (CUCM) — for CUCM environments, see the CP-6851-K9 model instead.

Free ground shipping on orders over $300. Same-day shipping on orders placed before 4PM EST.

All products include our industry-leading 10 Year Warranty backed by Reef Telecom.