AASTRA DT4x2 for MX-ONE User Guide EN - Manual (Page 48)

Outgoing Calls
DT412/DT422/DT432 48
Authorization Code, individual
If you are assigned to an individual Authorization Code (1 to 7
digits, assigned to your own extension) you can lock your own
extension to a common authority level, e.g. when out of the office.
You can also temporarily change any other used phone within the
exchange to the same authority level as you have on your own
phone. The individual code can be changed from your own
extension.
To lock your phone: *76*
Dial. е # ж
Enter Authorization Code and press.
Verification tone. æ
Press to finish the procedure.
To make calls with your authority level when your phone is locked: *75*
Dial. е # ж
Enter Authorization Code and press.
Verification tone. å
Dial the digit or digits to get an external line and the external
number.
To open your phone: #76*
Dial. е # ж
Enter Authorization Code and press.
Verification tone. æ
Press to finish the procedure.