Cisco
Cisco IP Phone 6851
Best reliable desk phone for professional business communication upgrades.
This remanufactured VoIP desk phone is designed for businesses upgrading to IP communications. It supports SIP and SRTP protocols across 4 lines, combining an attractive ergonomic design with secure, encrypted communications and wideband audio for a full-featured experience on third-party hosted call control. Key features include a high-resolution 3.5-inch grayscale display with white backlighting for easy reading and localized language support. Programmable line keys and fixed function keys enhance productivity, while the full-duplex speakerphone supports flexible collaboration. This model is ideal for professional environments seeking reliable, advanced telephony features.
$137.00
Owner Satisfaction
4.4
/ 5
Category Rank
42
/ 129
#42 in Conference Phones
Price vs Category Average
-55%
Below average
Condition
Refurbished
/ Refurbished
Who it's for
- Office administrators seeking streamlined, clutter-free desk installations
- IT managers needing efficient data throughput for connected workstations
- Professionals conducting frequent, long-duration voice calls
Who should skip it
- Users preferring modern, intuitive, and visually rich touch interfaces
- Organizations operating outside of the Cisco software ecosystem
- Workers requiring wireless headset freedom or flexible Wi-Fi placement
Performance breakdown
Call Clarity
Full-duplex speakerphone technology ensures crisp, professional audio during every conference call.
Interface Intuition
Traditional button layout makes navigation effortless for users transitioning to IP telephony.
Security Standards
Robust encryption protocols provide enterprise-grade protection for sensitive business communications.
Display Readability
High-resolution grayscale screen offers excellent visibility in various office lighting conditions.
Deployment Flexibility
Supports third-party hosted systems, making it a versatile choice for diverse networks.
Build Reliability
Remanufactured design delivers dependable performance at a fraction of new hardware costs.
Key Specs
Condition
Refurbished
Product Type
IP Phone
Lines Supported
4 lines
Display Size
3.5-in.
Display Type
Grayscale LCD with white backlighting
Connectivity
Network (RJ-45) with 2 ports
Power Source
PoE (RJ-45) Port
Mounting
Table-top and Wall-mountable
Know before you buy
No, the Cisco IP Phone 6851 is powered via Power over Ethernet (PoE) through your network switch. Ensure your network infrastructure supports PoE to power the device.
Yes, this model is specifically designed to support SIP protocols, making it compatible with a wide range of third-party hosted call control systems.
The Cisco 6851 supports up to 4 lines, which can be managed using the programmable line keys for efficient call handling.
Yes, the 3.5-inch grayscale display features white backlighting, which provides high contrast and clear visibility in various lighting conditions.
Yes, the phone is designed for both desk and wall-mount installations, offering flexibility for different office layouts.
Remanufactured means the device has been professionally inspected, tested, and restored to full working condition. It is a reliable, cost-effective alternative to buying new hardware.
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Ready to buy?
$137