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Cisco 8851 IP Phone CP-8851-K9
CISCO
Product Specification
| Brand | CISCO |
| SKU | PHONE-CISCO-8851-K9 |
| Product Type | IP Phone |
| Series | Cisco 8800 Series |
| Display | 5 Inch Color Display |
| Ethernet Ports | Gigabit Ethernet Ports |
| Protocol | VoIP SIP Protocol |
| Voice Quality | HD Voice Quality |
| Power | PoE Powered Device |
| Expansion Support | Supports Expansion Modules |
| Use Case | Desktop Office IP Phone |
About This Product
Overview
The Cisco 8851 IP Phone CP-8851-K9 is a business-focused desktop phone built for office environments that rely on dependable VoIP communications. As part of the Cisco 8800 Series, it combines a clear 5 inch color display with a practical desktop design to support daily calling tasks, contact management, and easy on-screen navigation. Its support for VoIP SIP protocol makes it suitable for organizations using SIP-based voice systems, while the Gigabit Ethernet ports help integrate the phone into modern networked workspaces. With HD voice quality, the phone is designed to support clear audio for routine business conversations, internal collaboration, and customer-facing communication. The PoE powered design also helps simplify deployment by allowing power and network connectivity over a single cable in supported environments.
Performance & Scalability
Built for business use, the Cisco 8851 offers a balanced combination of voice quality, network connectivity, and expansion support. The Gigabit Ethernet ports provide a strong foundation for office network integration, helping the phone fit into environments where reliable wired connectivity is important. HD voice quality supports clearer conversations, which can be valuable in busy offices, reception areas, and shared workspaces. For teams that need additional functionality, support for expansion modules gives the phone flexibility to adapt to changing communication needs. This makes the Cisco 8851 a practical choice for organizations looking to standardize on a desktop IP phone that can support both individual users and broader office deployments. Its PoE powered operation can also simplify installation in networked environments where streamlined cabling is preferred.
Storage Flexibility
While this product is not a storage device, its value comes from flexible communication features that help it fit into a wide range of office setups. The support for expansion modules allows the phone to be adapted for users who need additional line appearances or enhanced call handling options, depending on the deployment. The 5 inch color display provides a useful interface for viewing call information and navigating phone functions, which can improve day-to-day usability. Because it is a PoE powered device, installation can be more straightforward in structured network environments, reducing the need for separate power connections. These practical design elements make the Cisco 8851 a versatile option for businesses that want a reliable IP phone with room to grow.
Why Choose This Product?
The Cisco 8851 IP Phone CP-8851-K9 is a strong fit for businesses that want a professional desktop phone with clear voice quality and modern network support. Its combination of a color display, Gigabit Ethernet ports, SIP compatibility, and PoE support makes it well suited for office communication environments. The phone is designed to work as part of the Cisco 8800 Series, which is widely used in business voice deployments. For organizations that need a dependable IP phone for everyday use, the Cisco 8851 offers a practical feature set that supports efficient communication without unnecessary complexity. Expansion module support adds further flexibility for users with evolving call handling needs, making it a useful choice for scalable office phone setups.
Why Buy a Refurbished Products?
Refurbished enterprise servers offer enterprise-grade performance at a fraction of the new price.
Up to 70% Cost Savings
Refurbished R650xs units deliver identical hardware capability to new, at significantly lower upfront cost — freeing budget for CPUs, RAM, and storage.
Fully Tested & Verified
Every unit undergoes comprehensive hardware diagnostics before dispatch. POST tests, burn-in, memory checks, and power supply verification are standard.
Immediate Availability
Unlike new enterprise servers with lead times of weeks or months, refurbished stock is ready to ship within 24 hours of ordering.
Same Performance
The hardware inside the R650xs performs identically whether purchased new or refurbished. The 3rd Gen Xeon platform, PCIe Gen4, and iDRAC9 are unchanged.
Frequently Asked Questions
What type of phone is the Cisco 8851 CP-8851-K9?
It is a business desktop IP phone designed for office VoIP communication.
Does this Cisco IP phone support SIP?
Yes, the Cisco 8851 supports VoIP SIP protocol.
Does the Cisco 8851 have a color display?
Yes, it includes a 5 inch color display.
Is the Cisco 8851 powered by PoE?
Yes, it is a PoE powered device.
Can the Cisco 8851 support expansion modules?
Yes, this model supports expansion modules.