AASTRA 4187 Plus for BusinessPhone User Guide EN - Manual (Page 66)

Security
BusinessPhone – Dialog 4187 Plus 66
Security
You can use your four-digit password for blocking your phone from
unauthorized use, for making external calls from any blocked
extension, for entering the mailbox system or when you are using
the DISA function.
Note: For modifying your password, see section “ Change
Password ” on page 52.
Block Extension
u
Lift the handset. *72#
Dial to block your extension.
Verification tone. d
Replace the handset to finish the procedure.
Unblock extension u
Lift the handset. #72*
Dial. z
Dial your password. #
Press to re-open.
Verification tone. Your extension is open for use. d
Replace the handset to finish the procedure.