TELECOMMUNICATIONS ARRANGEMENTS AND METHODS

摘要

Networks III and IV have concluded service agreements with an international roaming platform (IRP 30) rather than bilaterally with networks I and III. When a subscriber (MS 20111) of one of these networks (III) is roaming in a visited network (I), a registration request is passed by the MSC (12A) of the visited network (I) to the international roaming platform (IRP 30) which checks that the visited network (I) and the home network (III) of the subscriber (MS 20III) have concluded service agreements with it and then passes the request to the home location register (HLR 10) of the home network (III). This home location register then produces authentication data which is transmitted by the international roaming platform (IRP 30) to the visited network (I) for authenticating the visiting subscriber (MS 20111). The subscriber's details are temporarily stored in the VLR (14A) of the visited network (I) and the subscriber's location is stored in the HLR (10) of the home network (III), thereby enabling the calls to be routed to and from the visiting subscriber (MS 20111). The calls themselves are not routed via the international roaming platform (IRP 30).