Ericsson DT59C - Manual (Page 42)

Outgoing Calls
DT590 42
To open an extension for some calls: #73*
Dial.
¿ # Ь Ы
Enter Authorization Code and press.
Verification tone. Ъ Щ
Press to finish the procedure.
To lock an extension *73*
Dial.
¿ # Ь Ы
Enter Authorization Code and press.
Verification tone. Ъ Щ
Press to finish the procedure.
Authorization Code, individual (optional)
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.
¿ # Ь Ы
Enter Authorization Code and press.
Verification tone. Ъ Щ
Press to finish the procedure.