| 摘要 |
<p>A subscriber of a mobile telecommunications system has a home network HPLMN 50H and is able to roam in a visited network VPLMN 50V. A Roaming Record RR 60 is generated when a subscriber uses telecommunication services in the visited network VPLMN 50V. Call Detail Records (CDRs) are generated when a call is terminated or originated by the home network HPLMN 50H. The system includes means for analysing Roaming Records and Call Detail Records to identify mis-routed telephone calls. In the embodiments, mis-routed telephone calls that are diverted from the fixed International carrier line 25 to a SIM box 64 via a voice over IP connection 66 are detected.</p> |
