| 摘要 |
A security system for a mobile network ( 1 ) has a gateway ( 3 ) for receiving messages from outside the network and a HLR ( 10 ) storing mobile terminal location information. The security system monitors in real time messages entering the network through the gateway ( 3 ), and decides according to said monitoring if messages are likely to be unsolicited. The system may block messages which are likely to be unsolicited. The system monitors a source address of a look-up request and a source address of a corresponding message, and decides that the message is likely to be unsolicited if its source address is different from that of the corresponding look-up request. The system further comprises a data store ( 5 ) and a timer ( 6 ), and stores look-up requests received from the gateway in the data store, and decides that a message is likely to be unsolicited if a corresponding look-up request has not been received within a pre-set time period.
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