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2N TELEKOMUNIKACE a.s., www.2n.cz
®
Tip
2N BRI Enterprise / BRI Lite
®
can also route outgoing calls into
the GSM/UMTS networks according to the B–channel used. In that
case, the GSM/UMTS module is paired with a specific B–channel of the
ISDN BRI line.
LCR Table
The LCR (Least Cost Routing) table is the key telephone cost cutting factor. It helps
you set call routing rules according to the CLIP, daytime and day in a week. By
entering state (bank) holidays into the LCR table you achieve even more remarkable
cuts.
To make the prefix–based call routing to external ports and the LCR table work
properly, select the module for the call in the
parameter while
Outgoing destination
creating the LCR record.
The gateway also allows you to route outgoing GSM calls on the basis of the SIM card
position. Such outgoing calls are not routed according to the GSM provider's number
but through the defined GSM module.
In addition, the ISDN ports can work in the DialThru mode. This means that all calls
are routed to the respective port without any check. Namely, from TE to NT and vice
versa.
Outgoing GSM Call Routing from Internal ISDN
If the GSM/UMTS gateway is connected to a subscriber line of your PBX, you are
advised to enable the DISA function to GSM to make your GSM gateway answer every
call routed to it by the PBX and wait for further dialling to GSM networks.
The GSM/UMTS gateway routes outgoing calls to GSM as follows:
The calling subscriber dials a user number.
If the user dialling is evaluated as
, the gateway barred
Access to GSM gateway
number table is searched through and, if a match is found, the call setup request
is rejected.
With an outgoing call, the 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
Count of dialled
for the called destinations while configuring your gateway. Then, the
digits
gateway initiates the outgoing call processing algorithm on receiving the last digit
The dialling prefix is first checked against the prefixes included in the first row of
the LCR table. If no match is found, the following row is used for check and so
on.
In case the prefix and call time comply with the routing rules, the call is routed
according to the first LCR rule to the module corresponding to the particular
included in the
list.
Outgoing GSM group
Outgoing destinations
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
