G.5.1 Scope of interception

33.1283GPPProtocol and procedures for Lawful Interception (LI)Release 18SecurityStage 3TS

For the service type of Voice, the NFs present in IMS domain provide the LI functions except for the case of inbound roaming targets with home routed roaming architecture.

A target can be a subscriber of the CSP, an inbound roamer or a non-local ID. In the case where a target is a non-local ID, the party communicating with the target can be non-roaming, inbound roamer or outbound roamer. When a target is non-local ID, provisioning of HSS and LTF are not applicable.

The interception of service type of Voice includes:

– Delivery of IRI, or CC based on the delivery type indicated in the warrant.

– When required, the delivery of LALS reports based on the LALS triggering.

– Whether a target is non-local ID.

– IMS services such as redirection, conferencing, application of media such as music or announcements.

The CSP may have differing implementation options for the interception of IRI and CC, for local as well as non-local ID targets. The CSP may also have differing implementation options for LALS triggering.

The CSP may have either an LBO based roaming architecture or a home-routed based roaming architecture.