Cisco 6851 Administration Guide

Figure 1: Cisco IP Phone 6800 Series Multiplatform Phones
In this document, the terms Cisco IP Phone, phone, or device mean Cisco IP Phone 6800 Series Multiplatform
Phones.
Note
Cisco IP Phone 6821 Multiplatform Phones Connections
Connect your phone to your LAN with an Ethernet cable to enable full functionality of your phone. If your
Ethernet port is equipped with Power over Ethernet (PoE), you can power the phone through the LAN port.
If you don't have PoE available, then you need to use a power adapter to power the phone. Do not extend the
Ethernet cable outside the building. For your phone to work, it must be connected to the IP telephony network.
Figure 2: Cisco IP Phone 6821 Multiplatform Phones Connections
Cisco IP Phone 6800 Series Multiplatform Phones Administration Guide
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About the Cisco IP Phone
Cisco IP Phone 6821 Multiplatform Phones Connections

Cisco 6851 Specifications

General

Network Protocols	SIP
Speakerphone	Yes
Bluetooth	No
Wi-Fi	No
USB Port	No
Display	3.5 inch grayscale display (396 x 162 pixels)
Ethernet	10/100 Ethernet
PoE	IEEE 802.3af
Audio	Wideband audio
Line Keys	4
Headset Port	RJ9
Supported Codecs	G.711, G.722, G.729, iLBC
Weight	0.9 kg