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  • Cisco Desk Phone 9851 VoIP Phone with Trusted Platform Module (TPM) 2.0 (DP-9851-L-K9) | New
Cisco Desk Phone 9851 VoIP Phone with Trusted Platform Module (TPM) 2.0 (DP-9851-L-K9) | New

Cisco Desk Phone 9851 VoIP Phone with Trusted Platform Module (TPM) 2.0 (DP-9851-L-K9) | New

SKU: DP-9851-L-K9-N
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Overview

Overview of Cisco Desk Phone 9851 VoIP Phone with Trusted Platform Module (TPM) 2.0 (DP-9851-L-K9) | New

The Cisco Desk Phone 9851 (DP-9851-L-K9) with Trusted Platform Module (TPM) 2.0 is a feature-rich, safe corporate VoIP phone made to provide outstanding audio quality, cutting-edge security and contemporary connection for today's workplaces. The 9851 has a bright 3.7-inch color screen, two Gigabit Ethernet connections with PoE Class 3 compatibility, six programmable line keys, USB-A and USB-C interfaces and a smooth integration with Webex Calling and Cisco Unified Communications Manager. Embedded TPM 2.0, FIPS compliance and end-to-end encryption for all communications guarantee strong security. It is perfect for executive offices, knowledge workers and collaborative spaces looking for a future-ready communications experience with unwavering privacy because of its elegant, ergonomic form and simple controls.


Key Features of Cisco Desk Phone 9851


3.7-inch Color LCD Display (480 x 240 px) with backlit, intuitive interface for easy navigation and crisp call handling.

Six Programmable Line Keys with configure speed dials, direct lines or call features for streamlined multitasking.

Trusted Platform Module (TPM) 2.0 with enhanced hardware-based security for robust device authentication, encryption and FIPS 140-2/3 compliance.

USB-A and USB-C Ports with integrate headsets, storage and firmware updates for greater flexibility.

Dual Gigabit Ethernet Portswith PoE that efficiently connect phone and a colocated PC to your network with PoE Class 3 support for simplified cabling.

Cisco Smart Audio Technologies with wideband audio, echo cancellation, background noise removal and acoustic shock protection ensure crystal-clear calls.

Comprehensive Codec Support with Opus, G.722, G.711, G.729, iLBC and more for high-definition voice across all environments.

Customizable Function Keys with dedicated keys for hold, transfer, conference, directory, speakerphone, mute and headset control.

Modern Security Protocols with secure boot, TLS/SRTP encrypted signaling and media, device authentication and security-enhanced Linux operation.

Modern, Ergonomic Design with compact footprint, easy-to-read display and user-friendly controls.


Benefits of Cisco Desk Phone 9851


🗹 Protect sensitive communications with TPM 2.0, encrypted media and signaling and compliance with leading security standards.

🗹 Wideband audio, advanced echo cancellation and smart background noise suppression optimize conversation clarity.

🗹 USB-A/USB-C and dual Ethernet ensure seamless compatibility with a wide range of workstyles and peripherals.

🗹 PoE and VLAN tagging streamline installation and management within modern enterprise networks.

🗹 Programmable keys and intuitive interface help users multitask, access contacts and manage calls with minimal effort.

🗹 Designed for compatibility with Cisco’s latest cloud, on-prem and hybrid solutions, supporting evolving workplace needs.

🗹 Matches premium office aesthetics, enhancing reception areas, executive desks and collaborative environments.

Specifications

Specifications for Cisco Desk Phone 9851 VoIP Phone with Trusted Platform Module (TPM) 2.0 (DP-9851-L-K9) | New

ManufacturerCisco
Manufacturer Part NumberDP-9851-L-K9
Product NameCisco Desk Phone 9851 VoIP Phone with Trusted Platform Module (TPM) 2.0
Product TypeVoIP Phone
Compatible Platforms
Cisco BroadWorks, Cisco Webex Calling, Cisco Webex Dedicate Instance (DI), Asterisk
Integrated Components
Trusted Platform Module (TPM) 2.0
Weight
34.14 oz
Body Color
First Light
Body Material
ABS polycarbonate, 74% post-consumer recycled plastic
Wireless Interface Provided
NFC
Call Services
Voice Mail, Caller ID, Call Waiting, Call Hold, Call Transfer, Call Forwarding, Call park/pickup
Caller ID Type
Caller ID/call waiting
Dialer Location
Base
Conference Call Capability
Yes
Speakerphone
Yes
Programmable Buttons Qty
6
Volume Control
Yes
Indicators
Speakerphone indicator, headset, mute indicator, calendar indicator, select indicator, line status indicator, status, busy lamp field (BLF)
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
Main Features
Integrated Ethernet switch
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
Lines Supported
46 lines
Quality of Service
IEEE 802.1Q (VLAN)
IP Address Assignment
DHCP, static
Security
IEEE 802.1X, EAP-FAST, EAP-TLS, FIPS 140-2, TLS 1.3, SRTP
Power Over Ethernet (PoE) Support
Yes
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)
Network Ports Qty
2 x Ethernet 10Base-T/100Base-TX/1000Base-T
Compatible Software
Cisco WebEx, Cisco Unified Communications Manager
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 buffer (AJB), dual tone multi-frequency (DTMF), HD audio, ultrasonic support
Network Features
Class 3 PoE
Type
LCD display - color
Display Location
Base
Diagonal Size
3.7"
Display Resolution
240 x 480 pixels
Backlit
Yes
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 (traditional), Chinese (Traditional, Hong Kong), Spanish (Columbia), UK English, US English
Connections
Headset jack / RJ-9 ¦ 2 x network / RJ-45 ¦ USB / 4 pin USB Type A ¦ USB Type-C / 24 pin USB-C
Hearing Aid Compatible
Yes
Placing / Mounting
Desktop
Cables Included
Network cable
ENERGY STAR Certified
Yes
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)
Width
8.9 in
Depth
8.4 in
Height
1.9 in
Weight
34.14 oz

User Guides

Frequently Asked Questions

Cisco Desk Phone 9851 VoIP Phone with Trusted Platform Module (TPM) 2.0 (DP-9851-L-K9)
Frequently Asked Questions (FAQ's)



What makes the Cisco 9851 different from previous models?
  • It features a built-in TPM 2.0 module for advanced hardware-based security and a more powerful processor.
  • Is this phone compatible with Cisco Unified Communications Manager (CUCM)?
  • Yes, it is fully supported and optimized for CUCM environments.
  • Does it support third-party SIP platforms?
  • Yes, the 9851 is SIP-compliant and can work with other VoIP systems that support SIP protocols.
  • What is TPM 2.0, and why is it important?
  • TPM 2.0 is a secure cryptoprocessor that protects encryption keys, passwords and sensitive data on the phone.
  • Can I use this phone without a PoE switch?
  • Yes, but you'll need to purchase an optional AC adapter if PoE is not available.
  • Does the touchscreen allow swipe and gesture control?
  • Yes, the 5" capacitive display supports multitouch gestures for a smartphone-like experience.
  • How many lines can the 9851 support?
  • It supports up to 10 lines or extensions, suitable for busy professionals or executives.
  • Is the audio quality suitable for speakerphone use?
  • Absolutely. It includes a wideband speaker and microphone for high-quality full-duplex conversations.
  • Can I connect a headset to this phone?
  • Yes, it supports USB and RJ-9 headset connections for hands-free calling.
  • Is this phone suitable for remote or hybrid workers?
  • Yes, it can be deployed in remote setups with VPN or cloud-based Cisco call systems.
  • Can firmware be updated remotely?
  • Yes, administrators can push secure firmware updates through CUCM or remote provisioning tools.
  • What ports are included on the phone?
  • It features two Gigabit Ethernet ports (LAN and PC), a USB port and an RJ-9 port.
  • Does it come with a stand or wall mount?
  • It includes an adjustable footstand; wall mount kits are sold separately.
  • Is this phone certified for secure environments?
  • Yes, with TPM and secure boot features, it meets stringent IT security requirements.
  • Does the Cisco 9851 support video calls?
  • No, this model is audio-only; for video, consider higher-tier Cisco models.
  • How is the phone powered if PoE is unavailable?
  • It requires a compatible Cisco AC adapter (sold separately).
  • Can this phone store call logs and directories locally?
  • Yes, it has local storage for call history, directories and settings.
  • Is it difficult to configure this phone for new users?
  • No, it features an intuitive interface and can be auto-provisioned by IT teams.
  • What kind of users is this phone best suited for?
  • Ideal for executives, remote workers, secure environments, and high-volume call handlers.
  • Can I customize the home screen or background image on the Cisco 9851?
  • Yes, users can personalize the background via settings if enabled by the system administrator.
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