O - 16
Operation
Callback (Knocking)
The subscriber you want to reach is telephoning or
does not answer. To avoid having to call back again
and again, you can activate a callback. You then
get a callback as soon as he hangs up or ends a
call. Your phone rings. You just have to Lift handset
and the subscriber is called automatically.
If the desired internal subscriber is busy and has not
activated the knocking prevention the desired recall
is signalled with the knocking tone. He hears the
h
z
q
r
* R U E q p
t
ª
Lift
handset
Dial the
subscriber
Busy or ringing
tone
Refer back
Internal callback / inter-
nal knocking / Callback
on busy
Internal knocking
tone/
Acknowledgement
tone of the ISDN
exchange
Subscriber answers,
hold conversation
Subscriber does not answer, replace handset.
This activates the callback
or
Notes ¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢¢
Knocking
- You cannot knock at an internal sub-
scriber
- from which a callback is already expected,
- whose connection is set to the terminal type an-
swering machine, fax, modem or combi-device.
If you want to knock at an internal subscriber re-
peatedly without holding a call you have to knock
again.
Callback -
you can activate several callbacks one
after another (from any internal subscriber).
You cannot activate a callback from an internal
subscriber
- from which another subscriber is already expect-
ing a callback
- who has switched on do not disturb on his tel-
ephone
- whose connection is set to the terminal type an-
swering machine, fax, modem or combi-device.
Callback from an internal subscriber:
- The callback is disconnected after 60 seconds if
you do not answer.
- A callback is cancelled if the callback was not
connected.
General callback:
You have activated a callback:
- If the do not disturb feature is switched on on
your phone, it will be temporarily deactivated.
- If a call diversion is set up on your phone, the
callback is not diverted.
In the event of a power failure: Callbacks are can-
celled.
You cannot use the "Knocking/Callback" features
on a combi-device (phone/fax).
Callback on busy
- No callback from the desired subscriber is possi-
ble when you hear the error tone. The ISDN fea-
ture "Callback on busy" is not available in the
exchanges for example.
- If you are unavailable for callback, the callback is
disconnected after 20 seconds and cancelled. Re-
peat the callback if necessary.
- A callback is cancelled when the callback has
been connected or is not connected within 45
minutes.
internal knocking tone whilst speaking. If he hangs
up, he will receive the call immediately.
Callback on busy
from an external subscriber is
only possible if your network provider supports the
ISDN feature.
You will receive an automatic callback as soon as
the subscriber is free.
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