AASTRA DT4x2 for BusinessPhone User Guide EN - Manual (Page 68)

Security
BusinessPhone – Cordless DT412/DT422/DT432 68
Security
You can use your four-digit Password for blocking your Cordless
from unauthorized use, for making external calls from any blocked
extension, for entering the Message system or when you are using
the DISA function.
Note: The first time you enter the Message system you
might be requested to change your Password if it is default
(0000). This procedure is performed directly in the Message
system. See section “ Messages ” on page 56.
Change Password
æ
Press.
#*72*
Dial to select a new Password.
å
Dial your present Password.
The default Password is 0000. *
Press.
å
Dial your new Password.
#
Press.
Verification tone.