AASTRA DT4x2 for MX-ONE User Guide EN - Manual (Page 43)

43 DT412/DT422/DT432
Outgoing Calls
If all external lines are busy when the Hook key is pressed after
dialing the external number (on-hook dialing): 6#
Press.
Notes:
If you were dialing off-hook (the Hook key was pressed
before the number), you are required to add the external
number now.
France, Finland and Sweden, press
5 #
æ
Press to finish the procedure.
When an external line becomes free you will be called back (recall
ring signal). You have to answer within eight seconds, otherwise the
Callback service is cancelled. While waiting for the Callback, you
can make and receive calls as usual. æ
Press when you are called back.
The system calls the external number.
Note: Only one Callback can be activated on a busy
external line.
Cancel any single Callback #37* å
Dial and enter the extension number.
Note: To cancel a single Callback on a specific external line,
dial the digit or digits to get a line instead of the extension
number. # æ
Press.
Wait for the call icon to stop flashing.
æ
Press to finish the procedure.