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Cisco IP Phone 8851

The Cisco® IP Phone 8851 is a business-class collaboration endpoint that combines high-fidelity, reliable, secure, and scalable voice over IP communications with Cisco Intelligent Proximity for teleph

  • 型号: CP-8851-K9=

The Cisco® IP Phone 8851 is a business-class collaboration endpoint that combines high-fidelity, reliable, secure, and scalable voice over IP communications with Cisco Intelligent Proximity for telephony integration for personal mobile devices to support small to large enterprise businesses.

With the Cisco IP Phone 8851, you can increase personal productivity through an engaging user experience that is both powerful and easy-to-use. The IP Phone 8851 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. It is also supported on third party hosted call control services.

In addition, Cisco Intelligent Proximity brings the worlds of desk and mobile together for you when you are using your mobile device at the desk for your work. You can move the audio path over to the Cisco IP Phone 8851 during active mobile calls to take advantage of its superior audio acoustics. An example would be to share a conversation with a colleague who you want to listen in. This capability gives you greater flexibility and a superior user experience when at your desk.

The IP Phone 8851 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 Cisco IP Phone 8851 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, 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.

Other key features of the phone follow:

   The Cisco IP Phone 8851 offers a 5-in. 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 Cisco IP Phone 8851 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.

   Two color options (charcoal and white) are available.

Features and Benefits

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

Table 1.       Features and Benefits of Cisco IP Phone 8851



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-in. 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 in. [55 cm] coiled and up to 72 in. (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 with 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 a 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.


  Bluetooth 3.0 Enhanced Data Rate (EDR) Class 1 technology (up to 66-ft [20m] range) is supported.  Hands-Free Profile (HFP) is supported for untethered headset connections and voice communications.  Phone Book Access Profile (PBAP) is supported for phone book object exchange between devices.


  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)

  IEEE Power over Ethernet class 3 for hardware version prior to V08, class 4 for hardware version V08 and above. In PoE class 3 case, one KEM can be attached and powered up through PoE together with the host 8851 phone, in PoE class 4 case, two KEMs can be attached and powered up 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)  8.6.2  9.1.2  10.5.2  11.0 and later

Cisco Unified Communications Manager Express (Unified CME)

  10.0 and later through fast track

Cisco Business Edition 6000 (BE 6000)

  8.6.2  9.1.2  10.5.2  11.0 and later

Cisco Hosted Collaboration Solution (HCS)

  8.6.2 and later (using supported UCM versions above)


The Cisco IP Phone 8851 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 8851.

Table 2.       Features and Specifications



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)

Key call features support

  + Dialing  Abbreviated dialing  Adjustable ring tones and volume levels  Adjustable display brightness  Agent greeting  Auto-answer  Auto-detection of headset  cBarge  Busy Lamp Field (BLF)  Busy Lamp Field (BLF) Pickup  Busy Lamp Field (BLF) speed dial  Callback  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  Hold  Intercom  Immediate divert  Malicious-caller ID  Message-waiting indicator (MWI)  Meet-me conference  Mobility  Music on hold (MoH)  Mute  Network profiles (automatic)  On- and off-network distinctive ringing  Personal directory  PickUp  Predialing before sending  Privacy  Private Line Automated Ringdown (PLAR)  Redial  Ring tone per line appearance  Service Uniform Resource Locator (URL)  Shared line  Silent monitoring and recording  Speed dial  Time and date display  Transfer  Uniform Resource Identifier (URI) dialing  Visual voice mail  Voice mail  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.

Cisco Intelligent Proximity

  Audio path moving sends audio through the IP Phone 8851 for a mobile device-connected call.  Call history synchronization allows you to view placed and missed calls of your mobile device from the 
IP Phone 8851.  Contact synchronization allows you to synchronize the contact objects from your mobile device to your 
IP Phone 8851.

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)   VLAN  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 Later (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  Safety   UL 60950 Second Edition   CAN/CSA-C22.2 No. 60950 Second Edition   EN 60950 Second Edition (including A11 & A12)   IEC 60950 Second Edition (including A11 & A12)   AS/NZS 60950   GB4943  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   EN61000-3-2   EN61000-3-3   KN22 Class B  EMC - Immunity   EN55024   CISPR24   EN60601-1-2   KN24   Armadillo Light  Telecom   FCC Part 68 HAC   CS-03-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)  Radio   FCC Part 2.1093 (BT RF Exposure TR)   RSS-102 (BT RF Exposure TR)   RSS-210   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

Product Specifications

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

Table 3.       Ordering Information

Product Number



  Cisco IP Phone 8851, Charcoal


  Cisco IP Phone 8851, White


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


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


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


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


  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


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

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