How to use Route Lists

Symptom:
You wish to distribute incoming Dialogic IMG Integrated Media Gateway calls to multiple outgoing Channel Groups, or redirect calls when Outgoing channel groups are full or unavailable.

Background:
In simple configurations, an IMG routes calls from an Incoming Channel Group to an Outgoing Channel Group, which is relatively straightforward. 

Using IMG Route Lists provides much greater flexibility in routing and redirecting calls, but requires a better understanding of how Route Lists work, in order to achieve the desired results.

This article explains how IMG Route Lists work, using five example scenarios.  

In each scenario, the call comes into the IMG on the SIP Channel Group, JB_Cube - ID:1.  

The scenarios progress from simple to complex.

Scenario 1
Without using a Route List the IMG routes calls from one channel group to another, via a route table.  We will use the following shorthand to describe this call flow (abbreviations defined in Glossary below) :

...

<-- 302, with Contact header of Alternate SIP gateway (OCG2)

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NOTE:  When using the Redirect feature, the route list hunting option must be set to 'Sequential.'

Scenario 5
As an alternate to redirecting calls, the route list hunting option can be set to use percentage routing.  For example, to distribute calls evenly to three channel groups, configure the percent allocation to 33, 33, and 34.  The percentage must always add up to 100 amongst the channel groups in the route list.  In addition, all channel group type entries must be set to 'Normal' and not redirect.

 
Product List
Dialogic IMG Integrated Media Gateway

Glossary of Acronyms / Terms
ICG: Incoming Channel Group
RT: Route Table
RL: Route List
OCG: Outgoing Channel Group