Auerswald COMpact 5200 Advanced Information page 254

Phoning
Unsuccessful Outgoing Calls
Note: You can also use this function on analogue phones, where it can
be performed via the T-Net function key/menu (optional, see manual for
the phone).
If the connection you are calling is busy, proceed as follows:
1. Press the Flash key or the Query key.
2. Dial *37#.
You will hear the confirmation tone.
3. Hang up the receiver.
As soon as the connection is no longer busy, you are called by the public
exchange for a period of 20 seconds.
4. Pick up the receiver to the make the callback.
Note: If you do not pick up the receiver within the 20 seconds during
which the PBX calls you, the callback request will be deleted.
If you pick up the receiver, the subscriber will be called.
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COMpact 5200/5200R/5500R - Firmware V7.2 - Advanced Information V04 07/2018