Aastra SIP 53I Administrator's Manual page 216

IP Phone Administrator Guide
Operational Features
Resetting a User Password
If a user forgets his password, either the user or an administrator can reset it so a
new password can be entered. The reset user password feature resets the password
to the factory default which is blank (no password).
You can reset a user password using the Aastra Web UI only at the path
Operation->Phone Lock. Use the following procedure to reset a user password.
Aastra Web UI
1 Click on Operation->Phone Lock.
5-6 41-001160-00, Release 2.1, Rev 04