G.5.3 Top level LIPF logic for service type voice

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

When a target ID is an IMPU, the warrant may specify whether a target is non-local ID. The host NFs that provide the LI functions when the target is non-local ID can be different from the host NFs that provide the LI functions when the target is not a non-local ID. The provisioning of IRI-POI in HSS and provisioning of LTF in support of LALS triggering applies only when the target is not a non-local ID.

Figure G.5-2 provides the top-level view of LIPF logic for the service type of Voice.

Figure G.5-2: Top level view of LIPF logic for service type of Voice

Within figure G.5-2, PEI (IMEI only) represents PEIIMEI. The target identity in the IMPI format may contain a value derived from a SUPI or an IMSI. The target identity in the IMPU format containing a SIP URI or TEL URI may contain a value derived from a GPSI, MSISDN, an E.164 number, or IMSI. Only IMPU is used for target non-local ID.

The LMISF-IRI is provisioned to support the interception of inbound roaming target (or party communicating with a target non-local ID target is inbound roaming) with HR that uses IMS services. The LMISF-IRI is expected to provide the LI functions only for non-emergency services.