Patent ID: 10616200

Abstract:
A method for authenticating a mobility management entity (MME) for outbound roaming subscribers includes maintaining a Diameter authentication information request (AIR)/update location request (ULR) mapping database at a Diameter edge agent (DEA). A Diameter AIR message is received at the DEA. The DEA determines that the AIR message includes a visited public land mobile network identifier (VPLMN ID) not of record in the database. The DEA records the VPLMN ID in the database. A Diameter ULR message is received at the DEA, and a VPLMN ID is read from the ULR message. The DEA determines that the VPLMN ID read from the ULR message does not match the VPLMN ID recorded for the subscriber in the database. In response to determining that the VPLMN ID does not match the VPLMN ID recorded for the subscriber in the database, the DEA rejects the ULR message.