Auerswald COMpact 4000 Operation Manual page 134

Telephoning
Unsuccessful Outgoing Calls
Initiating External Callback on Busy
Requirements:
• Fulfilling the technical requirements for a callback on busy (for instance, not all network
providers provide callback on a PTP connection)
• Service feature CCBS (callback on busy) is enabled by the network provider.
If the connection you are calling is busy, proceed as follows:
Important:
On system telephones, this function is called via the menu/phone app
(optional, see manual for the telephone).
To use this function at ISDN telephones or to delete it again, this function
must be supported via a function key or via the menu by the respective
telephone (optional, see manual for the telephone).
Note: You can also use this function on analogue telephones, where it can
be performed via the T-Net function key/menu (optional, see manual for the
telephone). Instead of the announcement by the central office, you will hear
the confirmation tone.
1. Press the Flash key or the Query key.
2. Dial *37#.
You will hear the confirmation tone.
Note: If you do not hear a confirmation tone, the callback request has been
rejected by the central office.
3. Hang up the receiver.
As soon as the connection is no longer busy, you will be called by the central office
for a period of 20 seconds.
Note: A callback will be stored in the central office for a duration of up to 45
minutes. If the called subscriber has not terminated his call until then, the
callback will automatically be deleted.
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 central office calls you, the callback request will be deleted.
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COMpact 4000 - Firmware V6.6A - Installation, Operation and Configuration V03 03/2016