2N BRI Lite/Enterprise v1.6 - Manual (Page 38)

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®
If the selected GSM module is busy or has a low credit, the preceding step is
repeated and the next LCR row is checked.
In case the selected GSM module is free and has a sufficiently high credit, the
GSM gateway starts dialling the GSM number.
If the calling subscriber number has an unknown prefix or all routes are busy, the
GSM gateway rejects the call setup request.
An outgoing call is not billed until the called party answers the call.
The GSM network signals the off–hook and the GSM gateway transfers this
information to the PBX.
The gateway is able to generate the AoC tariff pulses during an outgoing call,
which, if the GSM gateway is connected to the PBX, allows for call cost logging
per user.
Incoming GSM Call Routing
Incoming GSM calls are routed by the algorithm described in the following steps.
Incoming calls are processed according to the parameter in the Mode Incoming GSM
table. The following options are available: calls
Reject/Ignore incoming calls – incoming calls are not routed to extensions.
The call setup request can either be rejected or ignored on the GSM side (the
calling party hears the check ringing tone).
Report to PC – information on an incoming call is sent to a PC equipped with the
management software. The calling subscriber gets a voice message or the check
ringing tone. The management software then completes the call routing
procedure.
CallBack – this function helps establish connection on the account of the SIM
card inserted in the gateway. The incoming call is either ignored or rejected.
After the calling subscriber hangs up, the GSM gateway sets up connection to the
defined extension. When the extension answers, the GSM gateway replays the
CallBack message to the extension while establishing connection to the
previously calling GSM/UMTS subscriber. After the CallBack message, the GSM
gateway interconnects the call. If CallBack with incoming call ignoring is enabled
and the calling party fails to hang up within a defined timeout (default=10s), the
CallBack function is disabled for this call and the subscriber can go on dialling the
extension number. Set the CallBack function in the CLIP routing table.
If none of the above mentioned options is selected, the AutoCLIP routing table is
checked. If the calling number is found, the call is routed to the extension whose
number is assigned to the calling number in the table.
In case the calling number is not included in the AutoCLIP routing table, or the
AutoCLIP routing function is disabled, the gateway receives the incoming call and
either replays a voice message or transmits the dialtone to the calling subscriber.
Then the gateway awaits the count of digits necessary for call setup. Define the
minimum and maximum counts of DTMF digits in the Incoming GSM calls
menu.
If the gateway does not receive the minimum count of digits and no other digit
comes from the GSM network within the timeout defined in the DTMF dialling
, the call is rerouted to the extension included in the delay List of called
. numbers
If call forwarding to extension is inactive, the incoming call is rejected.