2 last external number re-dial, 3 when you receive a busy tone, 1 callback – AASTRA DT4x3 for MX-ONE User Guide EN User Manual
Page 35: 1 ordering callback, Press more, Select callback, and press select, Press and wait until the phone alerts

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1424-EN/LZT 103 089 Uen D 2010-02-12
6.2
Last External Number Re-dial
When you make an external call, the system automatically stores the
number dialed, regardless of whether the call was successful or not.
To re-dial the last external number dialed:
•
Press 11 and then
.
Note: Austria, U.S. and Canada press **; Denmark, Italy,
Sweden, U.K. and EBN press ***; Norway press #11.
6.3
When You Receive a Busy Tone
If you call an extension and receive a busy tone or get no answer, or if
all external lines are busy, you can use one of the following methods:
•
Callback
•
Intrusion
Note: These functions need to be programmed via the WinPDM
or CPDM. Please contact the system administrator.
6.3.1 Callback
When you order callback for a busy extension, you will be called back as
soon as the extension or line becomes free. If you order callback when
there is no answer, you will be called back when the extension has been
used the next time.
6.3.1.1 Ordering
Callback
To initiate callback when a called extension is busy, or when there is no
answer, do the following:
1.
Press More.
2.
Select Callback, and press Select.
Note: If Callback is not programmed and does not appear when you
press More, you can press 1 to initiate callback.
3.
Press
and wait until the phone alerts.
You are called back (recall ring signal) when the ongoing call is
finished or the next time a new call is finished. You have to answer
within eight seconds, otherwise the callback service is cancelled.
While waiting for callback, you can make and receive calls as usual.