AASTRA DT4x2 for MX-ONE User Guide EN - Manual (Page 106)

Settings
DT412/DT422/DT432 106
Set lock code
The lock code consist of one to four digits and you can change it
from your phone.
When you have entered Settings: г б
Select General. г б
Select Phone lock. ã
Select Set lock code. á
Press.
Select
Press (see display). å
Dial your lock code (one to four digits).
Save
Press to save the lock code (see display).
Clock settings
If the clock and date is set, you can on the same day a message or
call is received, see the time for it.
Set the clock to get the time automatically from the
system
When you have entered Settings: г б
Select General. ã
Select Clock. á
Press. â
or
ã
Select Auto setting.
Select
Press (see display).
Auto setting is shown.