Lcr table, Routing algorithm for outgoing calls – 2N VoiceBlue MAX v1.1 User Manual

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Mr. Green answers the call on his mobile phone. If the client wants to appoint a
meeting, Mr. Green parks the active call using a DTMF code and calls (blue arrows) line
222 to get through to his secretary's extension. Having agreed with the secretary, Mr.
Green transfers the parked call to the secretary and hangs up his mobile phone (green


In case the gateway – mobile phone connection is unsuccessful,
the PBX can send an SMS message including the calling number.

Correct ME configuration:

Connect the GSM gateway to your PBX/SIP Proxy.
Check whether the Mobility Extension licence key has been entered correctly.
Enter another prefix in

menu that matches

Gateway configuration, Prefixes

the MSN to which the PBX/SIP Proxy is calling (e.g. 333 as shown in the figure
Enter all ME users in the


Gateway configuration, Mobility Extension

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
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

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



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

GSM outgoing groups

assigned to the

in the


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


GSM outgoing groups

GSM outgoing group is assigned to a GSM module in the

Assignment to GSM groups

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 MAX




as follows:

VoiceBlue MAX

The calling subscriber dials the subscriber number and the SIP Proxy routes it to

depending on the SIP Proxy settings.

2N VoiceBlue MAX


The number prefix is checked against the prefixes in the


List of networks