The screen used for defining the Inbound Trunk Groups is divided into two parts. The upper half is used for the Source Channels, the lower half is used for the Destination Channels and the Route List. The Source Channels are Trunks that detect incoming calls and route them to a group of Destination Channels (Lines). The list of Destinations make up the Route List. Source channels must be Trunks. These are identified during Trunk Interface Provisioning. The LVN and ITG # for the Trunk must be set up. Destination Channels must be Lines.
The Route List is ordered from highest to lowest priority. When any Source circuit in the ITG detects an incoming call, it will always be routed to the first available Destination in the Route List. To move a channel in the Route List, click on the channel to highlight it and then press Up or Down to move it in the list.
There are 16 Inbound Trunk Groups for each Logical Versapath. The ITG identification numbers are in hexadecimal (digits 1-9 and A-F) to maintain compatibility with legacy equipment.
In the Inbound Trunk Group Definition screen above, the only Source channels that are available for selection are the ones that belong to Logical Versapath #1 and are assigned to ITG #1. All other circuits have been grayed out (in the example T1 timeslots 19 and 20 were assigned to Logical Versapath #2 so they are grayed out; timeslots 21-24 are data circuits). The Source channels are not selectable (they are just shown for reference).
In the Destination section, all available Lines (in this Logical Versapath) are selectable. Choose the circuits that will ring whenever an inbound call comes in on one of the Source channels. In the Route List, re-order the ringing priority as desired.
Repeat setting up the Inbound Trunk Groups for each Logical Versapath. It is OK to share Destination channels between ITGs!
Some Inbound Trunk Groups may need to have all of their calls auto-forwarded to an answering service or a night operator. To allow for call forwarding there are eight Call Forwarding Groups available to an entire Versapath system. A Call Forwarding Group can be assigned to any ITG. For example, ITG #1 may be the group of inbound channels that is routed to the Operator. These calls should be forwarded to the west coast after 6:00PM. Set the Call Forwarding Group number to an unused group. Then at 6:00PM, the Operator will dial in a special code and the number to forward the calls to. Part of the code is the Call Forwarding Group number.
If all of the Destination channels of an ITG are busy, then a "busy timer" is started to tell the network manager/monitoring station that this ITG is excessively busy. To allow busy alarm reporting, set the Report Events pulldown to Report. Otherwise, set it to Do Not Report.
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