SMT-W5100 User Guide _91Intern. Lock (Internal Lock)This function enables to lock incoming/outgoing calls to prevent others from using your phone withoutpermission.[MENU] X 7. Phone Settings X [OK] X Enter a passwordX *. Intern. Lock X [OK] X (Select lock option)X [OK]- To disable the lock function, select [1. Unlock].- To lock an outgoing trunk call, select [2. Lock Outgoing]. At this time,outgoing (incoming) calls are allowed.- To lock all outgoing/incoming trunk/station calls, select [3. Lock All Calls].- If the lock mode is set up, ‘LCK’ is displayed on the phone screen.