US Patent 7606197 Event notification in a hybrid network

When a mobile station requests circuit services notifications through a packet switched network, a mobile switching center sets a forwarding indicator. When the MSC detects an event indicative of a change in the status of the mobile station, the MSC sends an event notification to the packet switched network if the forwarding indicator is set to true. In the packet switched network, the base station can use the event notifications to manage communication resources used for packet data communications with the mobile station.