| 摘要 |
To monitor roaming calls, at first locations (1), first information (31) defining features of the roaming calls is received from second locations (2) for reporting the roaming calls to the first locations (1). In response to the first information (31), second information (32,33) defining the roaming calls being allowed and comprising requests for data is transmitted to the second locations (2), and third information (34,35) comprising responses with the data is received from the second locations (2) for evaluating the roaming calls, to perform on-the-fly roaming fraud detection and avoid clearing house constructions. The roaming calls may be billed via post-paid subscriptions. The data is arranged to create timing data defining timing features of billing periods of roaming calls. At the first locations (1), the third information (34,35) may be converted into reports (41,42) for said evaluating, and in response to evaluations, fourth information (36) may be transmitted to the second locations (2).
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