AASTRA DT4x2 for BusinessPhone User Guide EN - Manual (Page 32)

Outgoing Calls
BusinessPhone – Cordless DT412/DT422/DT432 32
Automatic Callback
You call an extension and receive busy tone or get no answer. 5
Press.
Verification tone.
Note: The number for automatic callback may differ from
country to country, see table “ Alternative programming for
Automatic Callback, Camp-on, Intrusion ” on page 108 æ
Press.
You are called back if the extension finishes the ongoing call or the
next time the extension finishes a new call. You have to answer
within eight seconds otherwise the Callback service is cancelled.
Busy extension
You call an extension and receive busy tone.
Camp-on
You can notify a busy extension of your call by a muted ringing call
(if this function is allowed). 4
Press to Camp-on.
Keep the Cordless off hook. When the called extension replaces
the handset, it will be called automatically.
Note: The number for camp on may differ from country to
country, see table “ Alternative programming for Automatic
Callback, Camp-on, Intrusion ” on page 108.
If you receive the busy tone again, the desired extension
does not allow Camp-on.