Datasheet

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Features
Benefits
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.
Wall-mountable
●
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- to 77-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. 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).
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
●
10.0 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
●
10.0 and later
Cisco Hosted Collaboration
Solution (HCS)
●
8.6.2 and later (using supported UCM versions above)
Licensing
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
Features
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
●
Application launch pad
●
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