AASTRA DT4x2 for BusinessPhone User Guide EN - Manual (Page 56)

Messages
BusinessPhone – Cordless DT412/DT422/DT432 56
Messages
By using the Message system you can send, receive, forward and
store different kinds of messages. You have also access to a
number of helpful features, like recording an ongoing conversation,
placing external calls via the company network and many more ...
Password protection
The first time you enter the Message system (only possible from
your own extension) you might be requested to change your
Password if it is default (0000).
Note: Some systems are programmed to allow the default
Password.
Follow the voice announcements.
You are requested to enter a new Password, confirm and save it. If
you use the default Password, you are requested to try again. æ
Press to finish the procedure.
Or:
Continue with any of the Message functions.
If you want to change your Password again, see section “ Change
Password ” on page 68.