Digital Cellular Telecommunications System (Phase 2+); Fraud Information Gathering System (FIGS); Service Description - Stage 1 (GSM 02.31 Version 7.1.1 Release 1998)
The present document specifies the stage 1 description of the Fraud Information Gathering System (FIGS) feature which provides the means for the HPLMN to monitor the activities of its subscribers in a VPLMN. The purpose of this network feature is to enable the HPLMN to monitor the activities of its subscribers while they are roaming. The VPLMN collects information about a defined set of activities on monitored subscribers and sends this information back to the HPLMN. This enables the HPLMN to clear certain types of calls and so stop fraudulent use of the GSM system. The present document enables service providers/ network operators to use FIGS@ and service limitation controls such as Operator Determined Barring (ODB) and Immediate Service Termination (IST)@ to limit their financial exposure to subscribers producing large unpaid bills. HPLMNs may also choose to monitor the activities of its subscribers within the HPLMN.