coM.sat ISDN Basic Manual page 45

coM.sat ISDN Basic
The "Return Call Handling" settings control the processing of a callback of the user
that was not reachable. When a call to a GSM party can not be established, the
gateway stores the called party number together with the calling party number
(normally an extension of the PBX) in a list.
When a call comes in from GSM the gateway looks for the calling party number in
this list. If an entry is found, the call will be directly connected to the stored extension.
The duration that an entry should remain in this list can be configured with the option
"Delete direct connection entry after". If there is no callback within this period, the
entry in the list is deleted.
The user who calls back can optionally hear an announcement telling him that he is
directly connected to a user who tried to call him. To achieve this, the option
"Announcement for callback" must be set to a programmed announcement. If it is,
the user calling back is connected immediately to play the announcement and
therefore is charged the GSM fee immediately even if the called user does not
answer the phone. If no announcement is set, the GSM call charging will start only if
the called user accepts the call.
For the return call, it is possible to insert a prefix in front of the called number (that
was the calling number during the first call) by specifying the prefix in the field "Prefix
for return call" and setting a minimum length in the field "Min. length of numbers
needing prefix". This instructs the device to insert the prefix only if the called number
has at least that amount of digits. This enables to handle return calls that were routed
from PSTN to the ISDN Basic via a PBX. These calls, which have longer calling party
numbers than internal callers, must have the PSTN prefix (usually a '0') inserted
when called back so that the PBX routes the call to PSTN, while internal callers are
called without prefix.
If the first called party was a VIP and the VIP calls the device, he is still able to dial
any number in contrary to other users. This enables a VIP to still use the device as all
the time without the need to make the return call. If the VIP wants to make the return
call, he can do this by dialling '#' instead of a number.
Every called party number can only be once in the list. A new call to this number
overwrites an older entry.
If both options are activated, the Return Call Handling has precedence because it
causes not costs. Only if this option can not work because CLIR is activated, the
Calling Number Transfer procedure is invoked.
Note: This function is only activated if there is a valid Basic Pro license (see 3.3.15).
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16/01/09 45 coMsat ISDN Basic Manual V2.7.doc
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