Lcr table, Routing algorithm for outgoing calls – 2N VoiceBlue Next v3.4 User Manual

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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 with

networks
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 is

of networks

Network number

routed according to the routing group parameters (

in the LCR table) as set in

Groups

the

table. The call will be connected via the GSM module as

GSM 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, the

Groups

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

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

tables

List 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 a

List 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 is

List of networks

routed to the module selected in the

table

Assignment to GSM groups

according to the first routing rule included in the

section and given in the

Groups

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 the

Groups

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