Roaming managing system for e.g. global system for mobile communication networks, has call server conveying communication between two terminal devices, between two roaming gateway devices or between gateway device and terminal device

摘要

The system has a mobile terminal device (100) and a roaming gateway device (200) respectively communicating with two mobile communication networks. An accounting, authorization and authentication server (600) has functionalities and databases for verifying public identifiers e.g. telephone numbers, and private identifiers of the devices. A call server (610) has functionalities and databases for conveying communication between two mobile terminal devices, between two roaming gateway devices or between the roaming gateway device and the mobile terminal device based on the public identifiers.