AASTRA DT292 for MX-ONE User Guide EN - Manual (Page 40)

Outgoing Calls
DT292 40
To assign your own authority level to another phone: *75*
Dial. Z *
Enter Authorization Code and press.
Z # Ь Ы
Dial your own extension number and press.
Verification tone. Z
Dial the digit or digits to get a line and the external number.
To change your individual Authorization Code: *74*
Dial. Z *
Enter old Authorization Code and press.
Z # Ь Ы
Dial new Authorization Code and press.
Verification tone. Ъ Щ
Press to finish the procedure.