Introduction

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

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 EnergyWiseT 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.

Design

Product type

IP Phone

Handset type

Wired handset

Product colour

Black

Backlight keypad

Y

Device lock

Y

Wall mountable

Y

Mounting

Desk/Wall

Phone features

Call waiting

Y

Speed dialling

Y

Call hold

Y

Call forwarding

Y

Caller ID

Y

Call pick up

Y

Call transfer

Y

Message-waiting indicator (MWI)

Y

Management features

Volume control

Digital

Display

Display diagonal

12.7 cm (5")

Display resolution

800 x 480 pixels

Touchscreen

N

Audio

Speakerphone

Y

Microphone mute

Y

Voice codecs

G.711a,G.722,G.729A,iLBC

Network

Ethernet LAN

Y

Wi-Fi

N

Bluetooth

Y

Bluetooth version

3.0+HS

Supported network protocols

SIP, SPD, UDP, GARP, DNS, TFTP, HTTPS, VLAN, RTP, RTCP, PPDP

Quality of Service (QoS) support

Y

DHCP client

Y

Security algorithms

EAP-FAST,EAP-TLS,HTTPS,SIPS,SSH,SSL/TLS

Networking standards

IEEE 802.3ab,IEEE 802.3af,IEEE 802.3at,IEEE 802.3i,IEEE 802.3u

Ports & interfaces

USB 2.0 ports quantity

1

Ethernet LAN (RJ-45) ports

2

RJ-9 ports quantity

1

DC-in jack

Y

Power

Power over Ethernet (PoE)

Y

Operational conditions

Operating temperature (T-T)

0 - 40 °C

Operating relative humidity (H-H)

10 - 90%

Storage relative humidity (H-H)

10 - 95%

Storage temperature (T-T)

-10 - 60 °C

Weight & dimensions

Width

257.3 mm

Depth

40 mm

Height

229.1 mm

Weight

1.19 kg

Packaging content

Number of handles included

1 pc(s)