IMG 1010 - Routing Components
Channel Group
A Channel Group is an aggregation of channels that have the same routing requirements. These groups enable you to assign a set of routing properties to all of the channels in a channel group and to assign channel groups to route lists for outgoing channel selection.
Translation Tables
Translation Tables specify the rules for digit matching, translation, and error detection that the IMG uses to process incoming and outgoing digit strings.
See IMG 1010 - Digit Translation.
Route Tables
Route tables specify the way in which the IMG routes or processes a call based on one or more sets of routing criteria.
You can create multiple route tables, each of which can contain multiple routing criteria. When the router routes a call, it searches each criteria type until it finds one that matches the call. The sequence in which the routing criteria are listed helps to ensure that the router uses the correct criteria type.
You can combine multiple criteria from one or more route tables and instruct the router to use these combined criteria to determine the appropriate terminating channel for a call.
You can also use route tables to override cause code treatments.
Route Lists
Route lists are sets of channel groups from which the router can select an outgoing channel for a call. The goal of the route lists is to route calls in the most efficient and cost-effective manner possible.
The channel groups that you assign to a route list provide alternate routes to a call destination. If the channels in one channel group are unavailable due to one of the Cause Codes listed below, the router attempts to select a channel from the remaining channel groups within the route list. The router searches the channel groups based on the hunting option that you specify for the route list. It selects an individual channel based on the hunting option that you specify within a channel group definition.
Re-routing Cause Codes:
NO CIRCUIT AVAILABLE - Cause Code 34
TEMPORARY FAILURE - Cause Code 41
EXCHANGE CONGESTION - Cause Code 42
Within each route list, you can define multiple channel group entries to specify alternate channels that the router can use to route a call.
If all of the channels in one channel group are seized, the IMG searches each channel group in succession until it either finds a free channel or it runs out of channel groups to check.
If the router cannot find a free channel, the call fails.
Treatment Tables/Cause Code Mapping Tables
In the event that a call can not be routed, the IMG can play a tone or an announcement and/or return a Cause Code to the network. Treatment tables specify the announcements or tones that the IMG plays when it detects an interruption in the call flow. You cannot modify the default Treatment Table.
Cause code mapping tables map a cause code to an alternate cause code, enabling you to override the default treatment behavior.
See IMG 1010 - An Overview of Error Handling
IP Bearer Profile
IP Bearer profiles allow the group to negotiate the terminal capabilities used in H.323 call setup.