Cisco CP-8851-K9 IP Phone 8851 - 5-Line Gigabit Color VoIP Business Phone, Bluetooth, USB, PoE - New

The Cisco CP-8851-K9 is a business-class 5-line VoIP IP phone built for knowledge workers, managers, and executives across small to large enterprise environments. It delivers wideband HD audio, encrypted voice communications, and a 5-inch widescreen color WVGA display at 800 x 480 resolution with 24-bit color. The phone features Cisco Intelligent Proximity for mobile integration, integrated Bluetooth, a built-in 2-port Gigabit Ethernet switch, and a USB charging port — powered via 802.3af / 802.3at PoE or the optional Cisco Power Cube 4. Note: This phone ships with Cisco's Enterprise firmware for use with Cisco Unified Communications Manager (UCM) and requires an Enhanced User Connect License (UCL) plus supported Cisco call control infrastructure to enable full functionality.

Cisco CP-8851-K9 - Key Features & Benefits

• 5-Inch Widescreen Color Display: 800 x 480 WVGA backlit LCD with 24-bit color and localized language support — including right-to-left on-screen text — for clear visibility of calls, contacts, and XML applications.
• Wideband HD Audio & Full-Duplex Speakerphone: Crystal-clear voice with a hearing-aid-compatible (HAC) handset and full-duplex speakerphone; supports G.711, G.722, G.722.2, G.729ab, and iLBC codecs (additional codec support varies by firmware version).
• Bluetooth, USB & Cisco Intelligent Proximity: Integrated Bluetooth 3.0 EDR Class 1 for wireless headsets and mobile pairing via Cisco Intelligent Proximity; side USB port for wired/wireless headsets and standard 5V / 500mA smartphone charging (not fast charging).
• Dual Gigabit Ethernet & PoE Single-Cable Deployment: Built-in 2-port 10/100/1000BASE-T switch shares one drop between phone and PC; powered via IEEE 802.3af or 802.3at PoE, with optional Cisco Power Cube 4 for non-PoE installs.
• Enterprise Security & KEM Expandability: Secure boot, TLS signaling encryption, SRTP media encryption, 802.1X authentication, and SSL VPN client; supports up to two CP-8800-A-KEM modules for up to 56 additional line/feature keys.

Cisco CP-8851-K9 - Technical Specifications

• Manufacturer: Cisco
• Part Number: CP-8851-K9
• Display: 5-in. WVGA backlit color LCD • 800 x 480 • 24-bit color
• Programmable Line Keys: 5 (expandable with optional KEMs)
• Audio Codecs: G.711 A-law/µ-law • G.722 • G.722.2 • G.729ab • iLBC (additional codecs may be available depending on firmware version)
• Speakerphone: Full-duplex wideband with Acoustic Echo Cancellation
• Bluetooth: Bluetooth 3.0 EDR Class 1 • HFP and PBAP profiles • range varies by environment
• Ethernet: 2x 10/100/1000BASE-T (RJ-45) — phone + PC pass-through
• USB Port: 1x side USB • 5V / 500mA standard smartphone charging output (not fast charging)
• Power: IEEE 802.3af / 802.3at PoE • Optional Cisco Power Cube 4 (CP-PWR-CUBE-4=, sold separately)
• Expansion: Up to 2x CP-8800-A-KEM (up to 56 additional keys, sold separately) • Optional wall-mount kit CP-8800-WMK=
• Color: Charcoal
• Dimensions (H × W × D): 9.02 x 10.13 x 1.57 in. (229.1 x 257.34 x 40 mm) excluding foot stand
• Weight: 2.62 lb (1.19 kg) with handset
• As-Shipped Firmware Compatibility: Ships with Cisco Enterprise firmware for use with Cisco Unified Communications Manager 12.5+, Unified CME 10.0+, BE 6000, and HCS (UCL license required, sold separately)
• Condition: New

Cisco CP-8851-K9 - Frequently Asked Questions (FAQ)

• Will this phone work with my third-party SIP platform (Asterisk, FreePBX, RingCentral, BroadSoft, 3CX) as shipped?
  As shipped, no. The CP-8851-K9 ships with Cisco's Enterprise firmware for use with Cisco Unified Communications Manager (UCM 12.5+), Unified CME 10.0+, BE 6000, or HCS, and requires an Enhanced User Connect License (UCL). The CP-8851-3PCC-K9 part number is the version that ships with Multiplatform (MPP) firmware for third-party SIP platforms. Cisco does offer an official firmware-conversion path between Enterprise and MPP for compatible hardware versions; this requires a separate Cisco-issued migration license that is not included with this listing.
• What is the difference between CP-8851-K9 and CP-8851-3PCC-K9?
  Hardware is identical; the difference is the firmware shipped from the factory. The CP-8851-K9 ships with Enterprise firmware for Cisco UCM environments. The CP-8851-3PCC-K9 ships with Multiplatform (MPP) firmware for third-party SIP platforms. Conversion between the two is possible only with a separately purchased Cisco migration license and is subject to hardware-version eligibility — this listing is sold as-is on the firmware shipped from Cisco.
• How is this phone powered, and is a power adapter included?
  The phone is powered via 802.3af or 802.3at PoE over a single Ethernet cable — no adapter needed when used with a PoE switch or injector. For non-PoE deployments, the optional Cisco Power Cube 4 (CP-PWR-CUBE-4=) is required and sold separately. Note: Like all Cisco IP phones, this device requires Cisco infrastructure or a supported call control system with appropriate licensing to operate fully.

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