Cisco IP Phone 8851NR Data Sheet

Data Sheet

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Updated:December 10, 2021

Bias-Free Language

The documentation set for this product strives to use bias-free language. For the purposes of this documentation set, bias-free is defined as language that does not imply discrimination based on age, disability, gender, racial identity, ethnic identity, sexual orientation, socioeconomic status, and intersectionality. Exceptions may be present in the documentation due to language that is hardcoded in the user interfaces of the product software, language used based on RFP documentation, or language that is used by a referenced third-party product. Learn more about how Cisco is using Inclusive Language.

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Updated:December 10, 2021


The Cisco® IP Phone 8851NR is a business-class collaboration endpoint that combines high-fidelity, reliable, secure, and scalable voice over IP communications without Bluetooth radio.

Cisco® IP Phone 8851NR

With the Cisco IP Phone 8851NR, you can increase personal productivity through an engaging user experience that is both powerful and easy to use. The IP Phone 8851NR combines an attractive, new ergonomic design with wideband audio for crystal-clear voice communications, always-on reliability, encrypted voice communications to enhance security, and access to a comprehensive suite of unified communication features from Cisco on-premises and hosted infrastructure platforms. The 8851NR (non-radio) model is for customers who still wish to have HD audio with flexibility to add Key Expansion Module (KEM) support but without integrated Bluetooth radio.

The IP Phone 8851NR also comes standard with a USB port so you can charge your smartphone when at your desk and stay connected when away from your desk.

The IP Phone 8851NR offers five programmable line keys. You can configure keys to support either multiple directory numbers or calling features such as speed dial. You can also boost productivity by handling multiple calls for each directory number using the multicall-per-line feature. Fixed-function keys give you one-touch access to applications, messaging, and directory, as well as often-used calling features such as hold/resume, transfer, and conference. A five-way navigation cluster helps you transition through menus more easily. Backlit acoustic keys provide flexibility for audio path selection and switching.

Additionally, Cisco has adopted circular design principles in our products by pioneering the use of post-consumer recycled plastic. The 8851NR is one of the models that now reduces the use of natural resources while closing the loop with its own electronic waste. Learn more about what this means at Cisco’s Circular Economy website.

Other key features of the IP Phone 8851NR:

     It offers a 5-inch, high-resolution (800 x 480), widescreen VGA backlit color display. Localized language support, including right-to-left on-screen text, meets the needs of global users.

     The phone supports a built-in Gigabit Ethernet switch for your PC connection.

     Support for Cisco EnergyWise technology makes the IP Phone 8851NR more energy-efficient and ecofriendly; the phone is qualified by the Energy Star organization.

     An optional wall-mount kit is orderable as a spare part for customers seeking this capability.

     Up to two optional IP Phone 8800 Key Expansion Modules with up to 56 additional line/feature keys are supported.

Features and benefits

Table 1 lists features and benefits of the IP Phone 8851NR.

Table 1.           Features and benefits



Hardware features

Ergonomic design

  The phone offers an easy-to-use interface and provides a traditional telephony-like user experience.

Graphical display

  The 800 × 480, 24-bit color, 5-inch WVGA display provides scrollable access to calling features and text-based XML applications.


  The handset is a standard wideband-capable audio handset (connects through an RJ-9 port).
  The standard coiled cord has a custom end for concealed cable routing beneath the phone
(cord length is approximately 21 inches [55 cm] coiled and up to 72 inches (183 cm) extended).
  The handset is Hearing Aid-Compatible (HAC) and meets Federal Communications Commission (FCC) loudness requirements for the Americans with Disabilities Act (ADA). You can achieve Section 508 loudness requirements by using industry-standard inline handset amplifiers such as Walker Equipment W-10 or CE-100 amplifiers. The dial pad is also ADA-compliant.

Speaker phone

  A full-duplex speakerphone gives you flexibility in placing and receiving calls hands free. For added security, the audible Dual Tone Multifrequency (DTMF) tones are masked when the speakerphone mode is used.

Analog headset

  The analog headset jack is a standard wideband-capable RJ-9 audio port.

AUX port

  You can use an auxiliary port to support electronic hookswitch control with a third-party headset connected to it.


  A side USB port enhances the usability of call handling by enabling wired or wireless headsets, as well as provides up to 500-mA power output at 5V or 2.5W for smartphone charging.

Ethernet switch

  An internal 2-port Cisco Ethernet switch allows for a direct connection to a 10/100/1000BASE-T Ethernet network (IEEE 802.3i/802.3u/802.3ab) through an RJ-45 interface with single LAN connectivity for both the phone and a co-located PC.
  The system administrator can designate separate VLANs (IEEE 802.1Q) for the PC and phone, providing improved security and reliability of voice and data traffic.


  The phone has the following keys:

      Line keys

      Soft keys

      Back and release keys

      Four-way navigation and select keys

      Hold/Resume, Transfer, and Conference keys

      Messaging, Application, and Directory keys

      Standard keypad

      Volume-control toggle key

      Speakerphone, headset, and mute keys

Backlit indicator

  The phone supports backlit indicators for the audio path keys (handset, headset, and speakerphone), select key, line keys, and message waiting.

Replaceable bezel

  The phone includes a black bezel; an optional silver bezel is also orderable separately.

Dual-position foot stand

  The display is easy-to-view and the buttons and keys are easy-to-use. The two-position foot stand supports viewing angles of 35 and 50 degrees; you can remove the foot stand for wall mounting, with mounting holes located on the base of the phone.


  You can install the phone on a wall using an optional wall-mount kit.

Key expansion module (KEM)

  The phone supports up to two KEMs to expand from 5 or 10 line buttons to 61 or 66 line buttons. You have the convenience of many speed dials or programmable features, or the necessity of following the activity of many lines.

Physical security

  The phone is compatible with the Kensington Security Slot (K-Slot) antitheft system.

Power features

IEEE Power over Ethernet (PoE)

  The phone offers IEEE Power over Ethernet class 3 for hardware versions prior to V08 and class 4 for hardware versions V08 and above. In the case of PoE class 3, one KEM can be attached and powered through PoE together with the host 8851 phone. In the PoE class 4 case, two KEMs can be attached and powered through PoE together with the host 8851 phone.
  The phone is compatible with both IEEE 802.3af and 802.3at switch blades and supports both Cisco Discovery Protocol and Link Layer Discovery Protocol - Power over Ethernet

Cisco IP Phone Power Cube 4

  This optional power cube is used as an AC-to-DC (48V) power supply for non-PoE deployments. Use of the power cube 4 also requires the use of one of the corresponding AC country cords.

Call-control support

Cisco Unified Communications Manager

  8.5.1 (non-secured mode only)
  11.0 and later

Cisco Unified Communications Manager Express (Unified CME)

  10.0 and later through fast track

Cisco Business Edition 6000 (BE 6000)

  11.0 and later

Cisco Hosted Collaboration Solution (HCS)

  8.6.2 and later (using supported UCM versions)


The Cisco IP Phone 8851NR requires an Enhanced User Connect License (UCL) in order to connect to Cisco Unified Communications Manager.

Product specifications

Table 2 lists the features and specifications of the Cisco IP Phone 8851NR.

Table 2.           Features and specifications




  Automatic Gain Control
  Comfort Noise Generation
  Silence Suppression/Voice Activity Detection
  Acoustic Echo Cancellation (AEC)
  Dynamic Noise Reduction

Audio codec support

G.711 a-law and mu-law, G.722, G.729a, Internet Low Bitrate Codec (iLBC), and Internet Speech Audio Codec (iSAC), G.722.1, G.772.2, OPUS

Key call features support

  + Dialing
  Abbreviated dialing
  Adjustable ring tones and volume levels
  Adjustable display brightness
  Agent greeting
  Auto-detection of headset
  Busy Lamp Field (BLF)
  BLF pickup
  BLF speed dial
  Call forward
  Call forward notification
  Call filter
  Call history lists
  Call park
  Call pickup
  Call timer
  Call waiting
  Call chaperone
  Caller ID
  Corporate directory
  Conference, including traditional Join feature
  Cross Cluster Extension Mobility (EMCC)
  Direct transfer
  Extension mobility
  Fast-dial service
  Forced access codes and client matter codes
  Group call pickup
  Immediate divert
  Malicious-caller ID
  Message Waiting Indicator (MWI)
  Meet-me conference
  Music on Hold (MoH)
  Network profiles (automatic)
  On- and off-network distinctive ringing
  Personal directory
  Predialing before sending
  Private Line Automated Ringdown (PLAR)
  Ring tone per line appearance
  Service Uniform Resource Locator (URL)
  Shared line
  Silent monitoring and recording
  Speed dial
  Time and date display
  Uniform Resource Identifier (URI) dialing
  Visual voicemail
  Whisper coaching

Electronic hookswitch

  You can control the hookswitch electronically with a third-party headset connected to either the USB port or auxiliary port, or directly paired with the phone through bluetooth.

Quality-of-Service (QoS) options

  The phone supports Cisco Discovery Protocol and 802.1Q/p standards, and can be configured with an 801.1Q VLAN header containing the VLAN ID overrides configured by the Admin VLAN ID.

Network features

  Session Initiation Protocol (SIP) for signaling
  Session Description Protocol (SDP)
  IPv4 and IPv6
  User Datagram Protocol (UDP) (used only for Real-Time Transport Protocol [RTP] streams)
  Dynamic Host Configuration Protocol (DHCP) client or static configuration
  Gratuitous Address Resolution Protocol (GARP)
  Domain Name System (DNS)
  Trivial File Transfer Protocol (TFTP)
  Secure Hypertext Transfer Protocol (HTTPS)
  Real-Time Transport Protocol (RTP)
  Real-Time Control Protocol (RTCP)
  Cisco Peer-to-Peer Distribution Protocol (PPDP)
  Cisco Discovery Protocol
  LLDP (including LLDP-MED)
  Switch speed auto-negotiation

Security features

  Secure boot
  Secure credential storage
  Device authentication
  Configuration file authentication and encryption
  Image authentication
  Random bit generation
  Hardware cryptographic acceleration
  Certificate Authority Proxy Function (CAPF)
  Manufacturer-Installed Certificates (MIC)
  Locally Significant Certificates (LSC)
  Ethernet 802.1x supplicant options: Extensible Authentication Protocol-Flexible Authentication via Secure Tunneling (EAP-FAST) and Extensible Authentication Protocol-Transport Layer Security (EAP-TLS)
  Signaling authentication and encryption using TLS
  Media authentication and encryption using SRTP
  HTTPS for client and server
  Secure Shell (SSH) Protocol server
  Secure Sockets Layer (SSL)-based VPN client

Physical dimensions
(H × W × D)

  9.02 x 10.13 x 1.57 in. (229.1 x 257.34 x 40 mm) (excluding foot stand)

Weight (with handset)

  2.62 lb (1.19 kg)

Phone-casing composition

  Polycarbonate Acrylonitrile Butadiene Styrene (ABS) textured plastic; Cosmetic class A

Operational temperature

  32 to 104°F (0 to 40°C)

Nonoperational temperature shock

  14 to 140°F (-10 to 60°C)


  Operating 10 to 90%, noncondensing
  Non-operating 10 to 95%, noncondensing

Language support

  Arabic (Arabic Area)
  Bulgarian (Bulgaria)
  Catalan (Spain)
  Chinese (China)
  Chinese (Hong Kong)
  Chinese (Taiwan)
  Croatian (Croatia)
  Czech (Czech Republic)
  Danish (Denmark)
  Dutch (Netherlands)
  English (United Kingdom)
  Estonian (Estonia)
  French (France)
  French (Canada)
  Finnish (Finland)
  German (Germany)
  Greek (Greece)
  Hebrew (Israel)
  Hungarian (Hungary)
  Italian (Italy)
  Japanese (Japan)
  Latvian (Latvia)
  Lithuanian (Lithuania)
  Korean (Korea Republic)
  Norwegian (Norway)
  Polish (Poland)
  Portuguese (Portugal)
  Portuguese (Brazil)
  Romanian (Romania)
  Russian (Russian Federation)
  Spanish (Columbia)
  Spanish (Spain)
  Slovak (Slovakia)
  Swedish (Sweden)
  Serbian (Republic of Serbia)
  Serbian (Republic of Montenegro)
  Slovenian (Slovenia)
  Thai (Thailand)
  Turkish (Turkey)

Certification and compliance

  Regulatory compliance
   CE Markings per directives 2004/108/EC and 2006/95/EC
   UL 60950 Second Edition
   CAN/CSA-C22.2 No. 60950 Second Edition
   EN 60950 Second Edition (including A11 and A12)
   IEC 60950 Second Edition (including A11 and A12)
   AS/NZS 60950
  EMC - Emissions
   47CFR Part 15 (CFR 47) Class B
   AS/NZS CISPR22 Class B
   CISPR22: 2005 w/Amendment 1: 2005 Class B
   EN55022: 2006 w/Amendment 1: 2007 Class B
   ICES003 Class B
   VCCI Class B
   KN22 Class B
  EMC - Immunity
   Armadillo Light
   FCC Part 68 HAC
   AS/ACIF S004
   AS/ACIF S040
   NZ PTC 220
   Industry standards: TIA 810 and TIA 920
   Industry standards: IEEE 802.3 Ethernet, IEEE 802.3af and 802.3at
   Korea (RRA Public Notification 2010-36, Nov 01, 2010)
   Korea (RRA Announce 2011-2, Feb 28, 2011)
   FCC Part 2.1093 (BT RF Exposure TR)
   RSS-102 (BT RF Exposure TR)
   EN 300.328
   EN50385 (BT RF Exposure TR)
   EN 301-489-1
   EN 301-489-17
   NCC LP0002
   Korea (RRL No. 2006-128, RRL No. 2006-129)
   Japan Bluetooth GFSK/EDR

Ordering information

Table 3 provides ordering information for the phone and its accessories.

Table 3.           Ordering information

Product number



  Cisco IP Phone 8851NR, Charcoal


  Spare Handset for Cisco IP Phone 7800, 8800, DX600 Series, Charcoal


  Spare Handset Cord for Cisco IP Phone 8800, DX600 Series, Charcoal


  Key Expansion Module for Cisco IP Phone 8800 Series


  Spare Wallmount Kit for Cisco IP Phone 8800 Series


  Spare Wallmount Kit for Cisco IP Phone 8800 Series with single KEM


  Spare Foot stand for Cisco IP Phone 8800 Series


  Spare Black Bezel for Cisco IP Phone 8800 Series


  Spare Silver Bezel for Cisco IP Phone 8800 Series


  Cisco Power Cube 4


  Power Cord Asia Pacific


  Power Cord Argentina


  Power Cord Australia


  Power cord for Brazil


  Power Cord European


  Power Cord China


  Power Cord Japan


  Power Cord North America


  Power Cord Switzerland


  Power Cord United Kingdom

Product sustainability

Refer to the CSR/Social Responsibility section for more information on Cisco’s environmental sustainability policies and initiatives.

Sustainability topic



Information on product material content laws and regulations


Information on electronic waste laws and regulations, including our products, batteries, and packaging

WEEE compliance

Sustainability inquiries


Certification and compliance

Table 2. Features and specifications of Cisco IP Phone 8851NR

Information on product takeback and resuse program

Cisco Takeback and Reuse Program


Cisco EnergyWise

Key features

Energy Star

Key features

Energy Star website

Power features

Table 1. Features and benefits


Product packaging weight and materials


Physical dimensions and weight

Table 2. Features and specifications of Cisco IP Phone 8851NR

Post-consumer recycled plastic

Circular design principles


Cisco IP Phone 8851NR phones are covered by a Cisco standard 1-year replacement warranty.

CSR/Social Responsibility

Information about Cisco’s Environmental, Social, and Governance (ESG) policies and initiatives can be found in Cisco’s Corporate Social Responsibility (CSR) Report.

Cisco Unified Communications Services

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More information

For additional details about the Cisco IP Phone 8800 Series, go to



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