Cisco 8821 Manual page 116

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Once the security profile has been created, it then needs to be applied to the Cisco Wireless IP Phone 8821 and 8821-
EX to enable TFTP encryption for that Cisco Wireless IP Phone 8821 and 8821-EX' configuration files.
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Select the configured security profile from the Device Security Profile drop-down menu.
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To create a Wireless LAN Profile, navigate to Device > Device Settings > Wireless LAN Profile within the Cisco
Unified Communications Manager's Administration interface.
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From the Wireless LAN Profile page, select Add New.
Cisco Wireless IP Phone 8821 and 8821-EX Wireless LAN Deployment Guide
116