What Is the CP-6851-3PW-UK-K9= Cisco Phone? Features, Compatibility, and Where to Source

Decoding the CP-6851-3PW-UK-K9= Identifier

The ​​CP-6851-3PW-UK-K9=​​ is a Cisco IP phone model designed for enterprise Unified Communications (UC) environments. While Cisco.com does not explicitly list this exact SKU, the naming convention reveals critical details:

• ​​CP​​: Indicates a Cisco Phone series.
• ​​6851​​: Refers to the 6800 series, a mid-tier IP phone with a 3-line display.
• ​​3PW​​: Likely denotes a ​​3-line PoE (Power over Ethernet) variant​​ with a UK-specific power adapter.
• ​​K9​​: Cisco’s standard suffix for cryptographic-capable devices.

Key Technical Features and Use Cases

Based on analysis of comparable Cisco 6800 series models and specifications from [“CP-6851-3PW-UK-K9=” link to (https://itmall.sale/product-category/cisco/), this device is optimized for:

• ​​Basic to mid-level deskphone needs​​: Supports SIP or SCCP protocols for VoIP calls.
• ​​Power flexibility​​: PoE (IEEE 802.3af) or optional external power supply (UK plug).
• ​​Security compliance​​: AES 128-bit encryption for secure voice traffic.

​​Critical distinctions from other 6800 models​​:

• ​​Regional power compliance​​: The UK-specific adapter ensures compatibility with local voltage standards (220-240V).
• ​​Limited expansion ports​​: No built-in Bluetooth or Wi-Fi, unlike higher-tier models like CP-8865.

Why Is This Model Not Listed on Cisco.com?

Cisco frequently phases out older UC devices or assigns region-specific SKUs to partners. The CP-6851-3PW-UK-K9= likely falls into one of these categories:

• ​​Legacy inventory​​: Discontinued but still supported for existing deployments.
• ​​Regional distribution​​: Tailored for UK/EU markets, with localized power and language packs.

Sourcing the CP-6851-3PW-UK-K9= in 2024

While Cisco.com no longer markets this model, ​​itmall.sale​​ specializes in verified, refurbished Cisco UC hardware. Their inventory includes:

• ​​Factory-reset devices​​ with tested firmware (e.g., Multiplatform Firmware for third-party PBX support).
• ​​Compatibility guarantees​​: Pre-configured for Cisco CallManager or BroadWorks.

Buyer Considerations: Compatibility and Longevity

Before purchasing, verify:

• ​​Protocol support​​: Does your PBX require SIP or SCCP?
• ​​Power constraints​​: If PoE isn’t available, confirm the external adapter’s specs (UK plug, 12V/1.5A output).
• ​​End-of-life status​​: While Cisco’s EoL notice for the 6800 series began in 2022, firmware updates may still be available.

Final Thoughts

The CP-6851-3PW-UK-K9= represents a cost-effective solution for businesses maintaining on-premises UC systems. While newer cloud-based alternatives dominate the market, this phone’s reliability and simplicity make it a pragmatic choice for environments prioritizing stability over cutting-edge features. Always validate firmware compatibility and warranty terms to avoid interoperability surprises.