Patent ID: 8855629

Claim:
A system comprising: a visitor location database of a Circuit-Switched (CS) domain that is able to provide voice communications to a mobile device; the visitor location database is configured to communicate with a first Mobility Management (MM) node of a first Packet-Switched (PS) data network that connects to the mobile device in a PS domain; the visitor location database is further configured to store MM data for the mobile device that indicates an association with the first MM node; the visitor location database is further configured to, in response to determining the mobile device moves from the first PS data network to a second PS data network, update the MM data for the mobile device to remove the association with the first MM node, generate a release indicator which indicates that the association with the first MM node has been removed, and transmit the release indicator to the first MM node so that the first MM node releases an association with the visitor location database from the MM data stored for the mobile device.