| 摘要 |
A method and apparatus for combating fraudulent use of a telecommunication system by subscribers who terminate calls improperly without allowing the termination of the call to be recorded, and thereby attempt to avoid correct payment for the call. The apparatus comprises a record means for creating a call detail record (CDR) of certain events for each call on which billing for each call can be based. A modified Call Agent (22) is provided for monitoring certain events related to all calls. The Call Agent (22) is also operable to check periodically whether a call is active or has been terminated improperly without the termination event having been recorded in the respective CDR for that call. A counter means (42) is provided that is operable, in the event of the Call Agent (22) detecting that a call has been terminated improperly by a selected subscriber, to start a count, that upon reaching a predetermined value, is used to shorten the time interval between subsequent periodic checks made by the Call Agent (22) in respect of subsequent calls involving the same selected subscriber.
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