Cisco 6821 Administration Guide

Analog Headsets 108
Wall Mount Kit 109
CHAPTER 7
Wall Mount Kit Components 109
Install the Cisco IP Phone 6821 Multiplatform Phones on a Wall 110
Install a Cisco IP Phone 6841, 6851, or 6861 with the Wall Mount Kit 114
Adjust the Handset Rest 117
Phone Administration 119
PART IV
Cisco IP Phone Security 121
CHAPTER 8
Security Features 121
Domain and Internet Setting 121
Configure Restricted Access Domains 121
Configure the Internet Connection Type 121
DHCP Option Support 122
Configure the Challenge for the SIP INVITE Messages 123
Transport Layer Security 124
Configure SIP Over TLS Signaling Encryption 124
Configure LDAP over TLS 124
Cisco Product Security Overview 125
Cisco IP Phone Customization 127
CHAPTER 9
Phone Information and Display Settings 127
Configure the Phone Name 127
Change Wallpaper from the Phone Page 128
Add a Logo as the Boot Display 128
Adjust Backlight Timer from Configuration Utility 129
Configure the Number of Call Appearances Per Line 129
Reverse Name Lookup for Incoming and Outgoing Calls 129
Enable and Disable Reverse Name Lookup 130
Call Features Configuration 131
Enable Call Transfer 131
Call Forward 131
Cisco IP Phone 6800 Series Multiplatform Phones Administration Guide
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Contents

Cisco 6821 Specifications

General

Brand	Cisco
Model	6821
Category	IP Phone
Language	English