ETSI - TS 123 035
Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); Immediate Service Termination (IST); Stage 2
|Publication Date:||1 April 2022|
This Technical Specification specifies the stage 2 description of the Immediate Service Termination (IST) service which provides the means for the HPLMN to terminate all the activities of an HPLMN subscriber in a VPLMN.
Two implementations of IST are described: an implementation based on CAMEL, and an implementation based on a new MAP message.