AASTRA DT4x2 for MD Evolution User Guide EN - Manual (Page 109)

109 MD Evolution – Cordless DT412 / DT422 / DT432
More Features on your Extension
Access Lock
By using the “Lock Prefix” you can lock access in order to prevent
unauthorized external calls. You can still make internal calls and you
can also receive incoming calls. 78 æ
Press to lock access.
All settings are cancelled.
Wait for the Service Acceptance Tone æ
Press to finish the procedure
Unlock Access 78
Press.
¿
Enter your password.
Note: To change your password see chapter“ Password
Programming ” on page 110 æ
Press to reopen.
All settings are cancelled.
Wait for the verification tone. æ
Press to finish the procedure