Cisco 6821 Administration Guide

Step 6 If the phone is in use, unplug the LAN and power cables from the phone.
The handset cable needs to be connected to the phone and seated in the cable channel.
Step 7 Remove the wall bracket from the wall and place it on the back of the phone so that the bracket fits in the
indentations in the back of the phone.
Make sure that the handset cable is between the phone and the bracket, as shown below.
Cisco IP Phone 6800 Series Multiplatform Phones Administration Guide
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Phone Accessories
Install a Cisco IP Phone 6841, 6851, or 6861 with the Wall Mount Kit

Cisco 6821 Specifications

General

Resolution	320 x 240 pixels
Speakerphone	Yes
Headset Port	Yes
Protocols	SIP
USB Port	No
Wireless	No
Bluetooth	No
Video Support	No
Conference Capabilities	Yes
Wall Mountable	Yes
Display	3.5-inch grayscale
Ethernet	10/100 Ethernet
Line Keys	2
PoE	IEEE 802.3af Power over Ethernet (PoE)
Codecs	G.711, G.722, G.729, iLBC
Weight	2.0 lb (0.91 kg)