Cisco DP-9851-K9 IP Phone
The Cisco DP-9851-K9 IP Phone is an enterprise-grade desk phone designed
for professional business communication. Part of the Cisco Desk Phone 9800
Series, it features a backlit 3.7-inch color display, Cisco HD Audio,
advanced security capabilities, SIP support, and Power over Ethernet (PoE)
connectivity.
Cisco DP-9851-K9 IP Phone Overview
The Cisco DP-9851-K9 IP Phone is designed for businesses and organizations
that require reliable, secure, and manageable IP communication. As part of
the Cisco Desk Phone 9800 Series, the Cisco 9851 combines a professional
desktop design with enterprise communication features and flexible network
connectivity.
The phone includes a backlit 3.7-inch color LCD with a resolution of
480 x 240 pixels. Its display provides a clear interface for call handling,
phone settings, directory access, and other communication functions.
Cisco DP-9851-K9 supports SIP-based communication and can be deployed with
compatible platforms such as Cisco Webex Calling, Cisco Unified
Communications Manager, Cisco BroadWorks, Microsoft SIP Gateway, and
Asterisk. Compatibility may depend on the platform version, firmware,
device package, licensing, and deployment configuration.
With Cisco HD Audio, background noise reduction, acoustic echo cancellation,
automatic gain control, and adaptive jitter buffering, the Cisco DP-9851-K9
is designed to support clear and consistent business conversations.
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Key Features of Cisco DP-9851-K9
- 3.7-inch backlit color LCD
- 480 x 240-pixel display resolution
- Cisco HD Audio support
- Advanced background noise reduction
- Acoustic Echo Cancellation and Automatic Gain Control
- SIP signaling support
- IPv4 and IPv6 network support
- Power over Ethernet support
- Enterprise-grade security features
- TLS and SRTP support
- Support for multiple audio codecs
- Compatibility with selected Cisco and SIP communication platforms
- Professional desktop design for office environments
Cisco DP-9851-K9 Technical Specifications
| Brand | Cisco |
|---|---|
| Product Model | DP-9851-K9 |
| Product Family | Cisco Desk Phone 9800 Series |
| Product Type | Enterprise IP Phone |
| Display | 3.7-inch color LCD |
| Display Resolution | 480 x 240 pixels |
| Backlight | Yes |
| Audio | Cisco HD Audio |
| Signaling Protocol | SIP |
| Network Support | IPv4 and IPv6 |
| PoE | IEEE 802.3af and IEEE 802.3at |
| Security | TLS, SRTP, Secure Boot, device authentication |
| Audio Codecs | Opus, G.722, G.722.2, iSAC, G.711, G.729, and iLBC |
| Dimensions | 226 x 214 x 49.4 mm |
| Weight | Approximately 968 g |
| Color | Carbon Black |
| Operating Temperature | 0°C to 40°C |
Benefits of the Cisco DP-9851-K9 IP Phone
Clear Business Communication
Cisco HD Audio and built-in audio processing technologies help provide
clear voice communication for daily business calls and internal
conversations.
Color Display Interface
The 3.7-inch backlit color display provides a clear and convenient interface
for call management, settings, and phone functions.
Enterprise Network Integration
SIP support, IPv4 and IPv6 compatibility, VLAN support, and PoE connectivity
make the phone suitable for many professional network environments.
Security-Oriented Design
Security features such as TLS, SRTP, secure boot, and device authentication
help support safer enterprise communication deployments.
Flexible Deployment Options
The Cisco DP-9851-K9 can be deployed with supported Cisco communication
platforms and selected SIP-based systems, depending on software version
and configuration requirements.
Cisco DP-9851-K9 Compatibility
The Cisco DP-9851-K9 is designed to work with supported enterprise
communication platforms, including:
- Cisco Webex Calling
- Cisco Unified Communications Manager (CUCM)
- Cisco BroadWorks
- Microsoft SIP Gateway
- Asterisk
Before deployment, verify the required firmware, CUCM version, device
package, licensing, provisioning method, and network configuration.
Who Is the Cisco DP-9851-K9 Designed For?
The Cisco DP-9851-K9 is suitable for organizations and professional users
that need a secure and manageable IP desk phone.
- Corporate offices
- Enterprise communication departments
- IT and network teams
- Customer service and support departments
- Businesses using Cisco communication platforms
- Organizations operating SIP-based phone systems
- Office users who require a color-display IP phone
Things to Check Before Buying
- Confirm compatibility with your phone system or CUCM version.
- Check whether the required license or device package is included.
- Verify PoE availability on your network switch.
- Confirm the device condition: new, refurbished, or used.
- Check firmware availability and provisioning requirements.
- Review warranty, return policy, and included accessories.
- Confirm the exact part number and regional configuration.
Frequently Asked Questions
What is the Cisco DP-9851-K9 IP Phone?
The Cisco DP-9851-K9 is an enterprise IP desk phone from the Cisco Desk
Phone 9800 Series, featuring a 3.7-inch color display, HD audio, SIP
support, PoE connectivity, and enterprise security features.
Does the Cisco DP-9851-K9 have a color display?
Yes. The Cisco DP-9851-K9 features a backlit 3.7-inch color LCD with a
resolution of 480 x 240 pixels.
Does the Cisco DP-9851-K9 support PoE?
Yes. The Cisco Desk Phone 9800 Series supports IEEE 802.3af and IEEE
802.3at Power over Ethernet standards.
Is Cisco DP-9851-K9 compatible with CUCM?
The Cisco DP-9851-K9 is supported with compatible Cisco Unified
Communications Manager environments. The required CUCM version, firmware,
device package, and licensing should be verified before deployment.
Which platforms support Cisco DP-9851-K9?
Supported platforms include Cisco Webex Calling, Cisco Unified
Communications Manager, Cisco BroadWorks, Microsoft SIP Gateway, and
Asterisk, subject to compatibility and configuration requirements.
What is the difference between Cisco DP-9841-K9 and DP-9851-K9?
The Cisco DP-9851-K9 includes a 3.7-inch color display, while the Cisco
DP-9841-K9 uses a 3.5-inch grayscale display. The exact feature differences
should be reviewed against the current Cisco product documentation.
| Weight | 1,4 kg |
|---|---|
| Dimensions | 8 × 24 × 32 cm |
| Brand |
Cisco |
| Cisco Series |
9800 Series |
| User Type |
Professional Business |
| Additional Functions |
One button to join (OBTJ), QR code access, conference mode, mute, Music on hold, Do not disturb, call recording, sleep mode, Kensington security slot |
| Backlit |
Yes |
| Body Colour |
Carbon black |
| Body Material |
ABS polycarbonate, 74% post-consumer recycled plastic |
| Cables Included |
Network cable |
| Call Services |
Voice Mail, Caller ID, Call Waiting, Call Hold, Call Transfer, Call Forwarding, Call park/pickup |
| Caller ID Type |
Caller ID/call waiting |
| Compatible Platforms |
Cisco BroadWorks, Cisco Webex Calling, Cisco Webex Dedicate Instance (DI), Asterisk |
| Compatible Software |
Cisco WebEx, Cisco Unified Communications Manager |
| Conference Call Capability |
Yes |
| Connections |
Headset jack / RJ-9 ¦ 2 x network / RJ-45 ¦ USB / 4 PIN USB Type A ¦ USB Type-C / 24 pin USB-C |
| Depth |
21.424 cm |
| Diagonal Size |
3.7" |
| Dialer Location |
Base |
| Display Languages |
Brazilian Portuguese, Catalan, Czech, Danish, Dutch, Finnish, French, French Canadian, German, Greek, Hungarian, Italian, Japanese, Korean, Norwegian, Polish, Portuguese, Russian, Spanish, Swedish, Turkish, Ukrainian, Chinese (simplified), Chinese (tradit |
| Display Location |
Base |
| Display Resolution |
240 x 480 pixels |
| ENERGY STAR Certified |
Yes |
| Hearing Aid Compatible |
Yes |
| Height |
4.94 cm |
| IP Address Assignment |
DHCP, static |
| Indicators |
Speakerphone indicator, headset, mute indicator, calendar indicator, select indicator, line status indicator, status, busy lamp field (BLF) |
| Integrated Components |
Trusted Platform Module (TPM) 2.0 |
| Lines Supported |
46 lines |
| Main Features |
Integrated Ethernet switch |
| Manufacturer |
Cisco Meraki |
| Network Features |
Class 3 PoE |
| Network Ports Qty |
2 x Ethernet 10Base-T/100Base-TX/1000Base-T |
| Network Protocols |
IPv4, IPv6, DHCP, GARP, DNS, TFTP, HTTPS, VLAN, RTP, RTCP, Cisco Discovery Protocol (CDP), Link Layer Discovery Protocol (LLDP), Link Layer Discovery Protocol – Media Endpoint Discovery (LLDP-MED) |
| Placing / Mounting |
Desktop |
| Power Consumption |
2.82 W (power adapter, display off mode), 2.69 W (PoE, display off mode), 0.24 W (power adapter, deep sleep mode), 0.69 W (PoE, deep sleep mode) |
| PoE |
Yes |
| Product Type |
VoIP phone |
| Programmable Buttons Qty |
6 |
| Quality of Service |
IEEE 802.1Q (VLAN) |
| Security |
IEEE 802.1X, EAP-FAST, EAP-TLS, FIPS 140-2, TLS 1.3, SRTP |
| Speakerphone |
Yes |
| Type |
LCD display – colour |
| Version |
original |
| VoIP |
Yes |
| VoIP Protocols |
SIP, SDP, RTCP, RTP, SRTP |
| Voice Codecs |
Opus, G.722, G.722.2, iSAC, G.711a-law, G.711μ-law, G.729a, G.729b, iLBC |
| Voice Features |
Acoustic echo cancellation (AEC), forward error correction (FEC), automatic gain control (AGC), comfort noise generation (CNG), voice activity detection (VAD), packet loss concealment (PLC), silence suppression, acoustic shock protection, adaptive jitter |
| Volume Control |
Yes |
| Weight |
968 g |
| Width |
22.606 cm |
| Wireless Interface Provided |
NFC |
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