LCR Table
The LCR (Least Cost Routing) table is the key telephone cost cutting factor. It helps
you select call routes according to the called subscriber's number and the day time and
weekdays. By adding bank holidays to the LCR table you achieve even higher call cost
savings.
To make your prefix and LCR routing work properly, enter the prefix and the total
count of digits for the number to be dialled to a GSM/UMTS network in the List of
. Furthermore, make sure that the SIM card of the provider consistent withnetworks
the defined group has been inserted in the GSM gateway. Use the Assignment to
table to assign outgoing and incoming calls to groups.GSM groups
Whenever a call is to be set up, the LCR table is searched sequentially from top to
bottom. If the called destination prefix matches the network prefix included in the List
table (and designated as in the LCR table), the call isof networks Network number
routed according to the routing group parameters ( in the LCR table) as set inGroups
the table. The call will be connected via the GSM module asGSM outgoing groups
assigned to the in the table.GSM outgoing group Assignment to GSM groups
If the selected GSM/UMTS module is busy, the call is routed according to the next
routing rule in the as defined by the table. Again, theGroups GSM outgoing groups
GSM outgoing group is assigned to a GSM module in the Assignment to GSM groups
table.
The LCR row is checked in this way until a free GSM/UMTS module is found. If no
available GSM/UMTS module ( ) is found, the call is rejected.GSM outgoing groups
Routing Algorithm for Outgoing Calls
The GSM/UMTS outgoing call routing algorithm is launched whenever the SIP Proxy
routes an outgoing call to . Outgoing calls are routed via 2N VoiceBlue Next
®
2N
®
as follows:VoiceBlue Next
The calling subscriber dials the subscriber number and the SIP Proxy routes it to
depending on the SIP Proxy settings.2N VoiceBlue Next
®
The number prefix is checked against the prefixes in the tablesList of networks
in the ascending sequence, i.e. table 1 is searched first, followed by table 2 and
so on.
When a matching prefix is found in a , the LCR is checked for aList of networks
valid row. Again, the LCR is searched upwardly, starting from the first row.
If a number matches a valid number on the respective row,List of networks
the call time is checked against the routing rule. If no match is found, the next
LCR row is checked.
If the number and call time meet the routing rules, the call isList of networks
routed to the module selected in the tableAssignment to GSM groups
according to the first routing rule included in the section and given in theGroups
table.GSM outgoing groups
Moreover, call duration limiting timer can be selected for the outgoing call.
If the selected GSM/UMTS module is occupied or has a low credit, the algorithm
returns to the preceding step but considers the next row instead of theGroups
first one. If no record is found in this section, the next LCR row is used.
If the selected GSM/UMTS module is available and has a sufficient credit, the
GSM gateway will start dialling the GSM number.
If the calling subscriber number has an unknown prefix or all routes are
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