Advanced - QoS/Security (Tab) - Security(Section)__Administrator Mode
Snom360/370: press "Settings" - Maintenance
Snom820/870: press "Menu" - Maintenance
V10: press "Settings" - Maintenance - Security
V7
<admin_mode perm="PERMISSIONFLAGS">VALIDVALUE</admin_mode>
This setting allows to switch between user and administrator mode of the phone.
<on>, <off>
on