22.0323GPPImmediate Service Termination (IST)Release 17Service descriptionStage 1TS
For the purposes of this specification the following definitions apply:
subscriber activities: subscriber activities that must be terminated. These can be call related events (e.g. call set-up, call termination) or the invocation of call related and call independent supplementary services (e.g. Call Hold, Call Waiting, Call Transfer, Call Forwarding, Unstructured Supplementary Service Data (USSD)).
For the purposes of the present document, the abbreviations given in TR 21.905  and the following abbreviations apply:
IST Immediate Service Termination
FIGS Fraud Information Gathering System