Auerswald COMpact 3000 analog Operating Manual page 109

– Fulfilling the technical requirements for a callback on busy (for instance, not all network
providers provide callback on a Point-to-Point connection)
If the connection you are calling is busy, proceed as described in the following.
1. Press the Flash key (when using a telephone with DTMF dialling) or the Query key
(when using an ISDN telephone).
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.
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.
If you pick up the receiver, the subscriber will be called.
Note:
You also have the option of letting the central office call you as soon as one
of the B channels on the previously called ISDN connection is available. If the
subscriber for which you have set up the callback is telephoning on the other
B channel, this callback will remain unsuccessful.
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.
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.
On the COMfortel 1100/1500/1600/2500/2500 AB/VoIP 2500 AB/2600
system telephones, this function is called via the menu (optional, see manual
for the telephone).
COMpact 3000 analog/ISDN/VoIP - Firmware V4.0 - Operating Manual V06 12/2020
Telephoning
Outgoing Calls
Initiating External Callback on Busy
109