Procedure
Step 1 On the phone web page, select Voice > System.
Step 2 Under the section System Configuration, locate the parameter User Password, and click Change Password
next to the parameter.
Step 3 Enter your current password in the Old Password field.
If you don't have a password, keep the field empty.
Step 4 Enter your new password in the New Password field.
Step 5 Click Submit.
The message Password has been changed successfully. will display in the web page.
Cisco IP Phone 6800 Series Multiplatform Phones User Guide
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Settings
Set Password from Phone Web Page