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To make call routing to external ports based on prefixes and the LCR table work
properly, enter the GSM provider prefix and the count of prefix-following digits
into the GSM destination table.
.
5.4. Routing of Outgoing GSM Calls
If the GSM gateway is connected to your PBX internal line, enable the DISA
function to the GSM network to make your GSM gateway answer every call
routed to it by the PBX and wait for further dialling to GSM networks.
Routing of outgoing calls via the GSM gateway proceeds as follows:
The calling subscriber dials a number.
The GSM gateway waits for further digits to be dialled. This
timeout results in a certain delay between the subscriber's
dialling and the subsequent dialling by the GSM gateway.
Therefore, select the
Default count of digits
for called
destinations while configuring your GSM gateway. Then the
GSM gateway initiates the outgoing call processing algorithm
on receiving the last digit.
The dialling prefix is first checked with the prefixes included
on the first line of the LCR table + prefix list. If no match is
found, the following line is used for comparison.
If the prefix matches a LCR prefix, the call time is checked for
match with the routing rule on the line. Again, if no match
is found, the following LCR table line is searched.
In case the prefix and call time comply with the routing rules,
the call is routed according to the first routing rule included
in Groups and
GSM outgoing callss
to the module
corresponding to the particular
GSM outgoing calls
.
If the selected GSM module is busy or has an insufficient
credit, the preceding step is repeated for the following line
of the
LCR table
section. If there is no record, the next LCR
table line is searched.
In case the selected GSM module is free and has a sufficiently
high credit, the GSM gateway starts dialling a GSM number.
If the calling subscriber number has an unknown prefix, or all
routes are busy, the GSM gateway rejects the call request.
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