Routing algorithm for outgoing calls, Call routing 3.3 – 2N VoiceBlue Next v3.0 User Manual

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Call Routing



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 (GSM outgoing groups) is found, the call is rejected.

Routing Algorithm for Outgoing Calls

The GSM/UMTS outgoing call routing algorithm is launched whenever the SIP Proxy
routes an outgoing call to 2N


VoiceBlue Next. Outgoing calls are routed via 2N


VoiceBlue Next as follows:

The calling subscriber dials the subscriber number and the SIP Proxy routes it
to 2N


VoiceBlue Next depending on the SIP Proxy settings.

The number prefix is checked against the prefixes in the List of networks
tables 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 List of networks, the LCR is checked
for a valid row. Again, the LCR is searched upwardly, starting from the first

If a List of networks number matches a valid number on the respective row,
the call time is checked against the routing rule. If no match is found, the
next LCR row is checked.

If the List of networks number and call time meet the routing rules, the call
is routed to the module selected in the Assignment to GSM groups table
according to the first routing rule included in the Groups section and given in
the GSM outgoing groups table.

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 Groups row
instead of the 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
occupied, 2N


VoiceBlue Next rejects the connection request.

The outgoing call is not billed until the called party answers the call.

The GSM network signals the call answering moment and the GSM gateway
transfers this information to the SIP Proxy.

It can be set for GSM outgoing calls that the calling subscriber should be sent
the connection tone


instead of a silence between the request sending to GSM

and the ringing tone.


This option can be activated for TC35i modules.