When using "Automatic Node Topology Detection" feature to switches with mixed routes to a partner system i.e. IP trunking and TDM, then the Automatic Topology will not work unless there is a corresponding overlay network with Gateway Information in AMO LDAT (GW parameter) to the partner nodes. Required is therefore to use the configuration of an overlay network via IP trunking to the corresponding nodes with correct GW LDAT partner entries. If the configuration is incorrect then no TSC Setup will be sent for the feature.