Important
MPP Version - Not compatible with Cisco Unified Communications Manager (CUCM).

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.

Key features:

offers a 5-in. high-resolution (800 x 480) widescreen VGA backlit colour display. Localized language support, including right-to-left on-screen text, meets the needs of global users.
High-quality, full-duplex, wideband audio and superior echo cancellation for exceptional clarity when communicating.
Simplified dialing and expanded status detail with the optional Cisco IP Phone 8800 Key Expansion Module
Choice of wired, USB and Bluetooth headsets from Cisco third-party vendor partners.

Further information
Broschure

Datasheet

Technical details

Full lines supported: 10 lines (SIP registrations)

Audio features

G.711 a-law and mu-law, G.722, G.729a/b, Internet Low Bitrate Codec (iLBC), and Internet Speech Audio Codec (iSAC), G.722.1, G.772.2, OPUS
Flexibility in placing and receiving calls with hands free thanks to a full-duplex speakerphone

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

Telephony features

+ 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), BLF Pickup & speed dial
Callback
Call forward & call forward notification
Call filter & history lists
Hold, park & pickup call
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
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
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

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
SSL-based VPN client

Size (H x W x D): 229,1 mm x 257,34 mm x 40 mm (9,02 Zoll x 10,13 Zoll x 1,57 Zoll)

Weight: 1,19 kg

User interface

An easy-to-use interface that provides a traditional telephony-like user experience
The 800 × 480, 24-bit color, 5-in. WVGA display provides scrollable access to calling features and text-based XML applications

The 8851 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

Cisco applications

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)

Language support: Arabic, Bulgarian, Catalan, Chinese, Chinese, Croatian, Czech, Danish, Dutch, English, Estonian, French, Finnish, German, Greek, Hebrew, Hungarian, Italian, Japanese, Latvian, Lithuanian, Korean, Norwegian, Polish, Portuguese, Romanian, Russian, Spanish, Slovak, Swedish, Serbian, Slovenian, Thai, Turkish

Power

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 (LLDP-PoE).

Compliance

Regulatory compliance: