Abstract: A controller that monitors usage status of trunk lines associated with a switch that operates to handle call connections between calling devices and called devices on trunk lines associated therewith. An exemplary controller comprises N call application nodes capable of executing trunk idle list server applications that allocate ones of the trunk lines to the call connections, wherein a first trunk idle list server application is executed on a first call application node and is associated with a second trunk idle list server application executed on a separate second call application node.

Abstract: A controller for allocating call identity values to call connections associated with a switch, wherein the switch handles call connections between calling devices and called devices on trunk lines associated with the switch. The controller comprises N call application nodes for executing identity server applications that allocate call identity values to the call connections, wherein a first identity server application is executed on a first call application node and is associated with a second identity server applications executed on a second call application node separate from the first call application node.