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Cisco 9851 IP Desk Phone - 6 SIP Lines, 3.7" LCD, Dual Gigabit Ethernet with PoE

The Cisco DP-9851-K9 is a premium business IP desk phone designed to deliver exceptional voice communication, advanced collaboration features, and enterprise-grade security for modern workplaces. Built to support hybrid work environments, corporate offices, and executive users, this high-performance IP phone combines an intuitive user experience with crystal-clear HD audio to ensure reliable and professional communications. Featuring a large high-resolution color display, programmable line keys, and an ergonomic design, the DP-9851-K9 enables users to efficiently manage multiple calls, access essential business functions, and improve daily productivity. It supports SIP-based VoIP communication, seamless integration with Cisco Unified Communications platforms, and compatibility with a wide range of enterprise network infrastructures. Equipped with Gigabit Ethernet ports, the phone provides high-speed network connectivity while supporting Power over Ethernet (PoE) for simplified deployment and reduced cable requirements. Advanced security technologies, including secure boot, encrypted signaling, and media encryption, help protect sensitive business communications from unauthorized access. The Cisco DP-9851-K9 also supports Bluetooth connectivity, USB interfaces, and optional headset integration, offering flexible communication options for professionals who require mobility and hands-free operation. Its energy-efficient design, easy remote provisioning, and centralized management capabilities significantly reduce IT maintenance costs while ensuring consistent performance across large-scale deployments. Ideal for enterprises, government organizations, educational institutions, healthcare facilities, financial services, and customer service centers, the Cisco DP-9851-K9 delivers reliable voice quality, enhanced collaboration capabilities, and long-term operational stability. As a trusted Cisco business communication solution, it offers excellent scalability, simplified deployment, and dependable performance, making it an ideal choice for organizations seeking to upgrade their unified communications infrastructure with a secure, feature-rich, and highly reliable IP desk phone.

  • DP-9851-K9

  • Cisco

  • Original New

  • 1 year

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Official Specification

Model Part Number

DP-9851-K9

Product Name

Cisco Desk Phone 9851 IP Phone, Carbon Black

Product Series

Cisco Desk Phone 9800 Series Enterprise VoIP Desk Phone

Target Application

Enterprise Office Knowledge Workers, Hot Desking, Shared Workstations, Hybrid Workplace, Corporate Call Center Auxiliary Stations

Operating System

Cisco PhoneOS Unified Single Platform System

Supported Call Platforms

Cisco CUCM 12.5+, Webex Calling, BroadWorks, 3rd Party Cloud Calling / Open SIP

Display Screen

3.7-inch Backlit Color LCD, 480 × 240 Resolution

Line & Programmable Keys

6 Physical Line Keys, Max 46 Total Programmable Feature Keys

Supported KEM Module

Compatible with Cisco 9800 Key Expansion Module (1 unit max)

Audio System

Cisco Smart HD Audio with AI Noise Cancellation; Full-Duplex Speakerphone; Hearing Aid Compatible (HAC) Handset

Supported Audio Codecs

OPUS, G.722, G.722.2, iSAC, G.711a/μ, G.729a/b, iLBC

Physical Network Ports

2 × 10/100/1000BASE-T Gigabit RJ45 Ethernet Switch (LAN + PC Passthrough)

USB Interfaces

1 × USB-A Port, 1 × USB-C Port (USB Headset / Mobile Charging / Dongle Support)

Handset Port

RJ9 Dedicated Handset Jack

Headset Support

Wired USB Headsets, Bluetooth Headsets via USB Dongle

Power Supply Standard

IEEE 802.3af Class 3 PoE Powered (Default); Optional Separate AC Power Adapter (Sold Separately)

Core Functional Buttons

Customizable Action Button, Calendar, Favorites, Hold, Transfer, Conference, Directory, Application Keys

Collaboration Features

OBTP One-Click Meeting Join, Desk Reservation, Hot Desking Sign-In

Security Architecture

TPM 2.0 Chip, Secure Boot, Image Authentication, TLS 1.3 Encryption, Government-Grade End-to-End Call Encryption

Mounting Options

Standard Desktop Stand Included; Optional Wall Mount Kit (Purchased Separately)

Color Finish

Carbon Black

Physical Dimensions (W × D × H)

245 mm × 205 mm × 170 mm (9.65 × 8.07 × 6.69 in)

Net Weight

1.08 kg (2.38 lbs)

Operating Environment

Temperature: 0°C ~ 40°C; Humidity: 10%–90% Non-Condensing

Storage Environment

Temperature: -20°C ~ 65°C; Humidity: 10%–90% Non-Condensing

Package Contents

9851 IP Phone, Handset, Handset Cord, Adjustable Desktop Stand, Ethernet Cable, User Guide

Factory Warranty

Cisco 1 Year Limited Hardware Warranty

Regulatory Certifications

CE, FCC, UL, RoHS Compliant

Shenzhen Importgm Technology Co., Ltd.

Shenzhen Importgm Technology Co., Ltd. has been operating in the I T services market since 2010, focusing on the R&D, design and sales of core equipment and general accessories in the field of network communications, we are distributors and resellers of worldwide brands of communication equipment, general accessories and system solutions for global customers.We offer a wide range of products, including networking routers, switches, firewalls, servers, I P phones, video conferencing equipment, wireless A P, P D U and modules. We are located in Shenzhen with convenient transportation access. Over the years we have developed a team of highly skilled staff that delivers quality and effective solutions and services. Based on our rich experience, we can supply products with stable packages, reliable delivery, competitive prices and on-time support. Our products are exported to customers in such regions as the Middle East, Africa, America,Europe and Asia. We also welcome O E M and O D M orders.Whether selecting current products from our inventory or seeking engineering assistance for your project bid, you can consult our business staff at any time. Our service does not end when the invoice is printed but begins as soon as you have received your order. Any customers' business visit and negotiation is warmly welcomed. Let's work together and win-win.

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Q: What are the key features of the DP-9851-K9?

A: The DP-9851-K9 features a high-resolution color display, HD voice quality, and advanced communication capabilities, making it suitable for modern business environments.

Q: How to set up the DP-9851-K9 IP phone?

A: Connect the DP-9851-K9 to your network and power source, then follow the on-screen setup instructions or your administrator’s configuration guide for deployment.

Q: Does the DP-9851-K9 require firmware updates?

A: Yes. Regular firmware updates are recommended for the DP-9851-K9 to improve performance, enhance security, and ensure compatibility with the latest features.

Q: Are there alternative products to the DP-9851-K9?

A: Alternatives to the DP-9851-K9 include other Cisco Desk Phone models, offering different display sizes, feature sets, and deployment options for various business needs.

Q: What are common troubleshooting tips for the DP-9851-K9?

A: Check the network connection, verify power and cable connections, restart the device, and ensure the firmware is up to date to resolve common issues.


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