G.5.5.1 The flowchart

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

Figures G.5-7, G.5-8 and G.5-9 show the LIPF logic for the service type of Voice when the target is a non-local ID.

Figure G.5-7: LIPF logic for service type of Voice when target is a non-local ID

For the delivery type of IRI + CC, the IRI-POIs and the CC-TFs are provisioned. For the delivery type of IRI, the IRI-POIs are provisioned. For the delivery type of CC, the CC-TFs are provisioned.

Figure G.5-8 shows the LIPF logic for the provisioning of IRI-POIs and figure G.5-9 shows the LIPF logic for the provisioning of CC-TFs.

Figure G.5-8: LIPF logic for delivery type of IRI for service type of Voice when target is a non-local ID

The P-CSCF, IBCF and MGCF (in figure G.5-8) provide IRI-POI functions under certain conditions as noted within the illustration. To prevent those IRI-POIs from providing the LI functions when not supposed to, the LIPF may have to include a parameter during the provisioning.

If STIR/SHAKEN is required to be intercepted in the network, the provisioning of IRI-POI in IBCF include the parameter ReportDiversionPASSporTInfo. Additional STIR/SHAKEN related provisioning for target non-local ID is illustrated in figure G.5-9A.

Figure G.5-9: LIPF logic for delivery type of CC for service type of Voice when target is a non-local ID

The P-CSCF, IBCF and MGCF (in figure G.5-9) provide CC-TF functions under certain conditions as noted within the illustration. To prevent those CC-TFs from triggering the CC-POI when not supposed to, the LIPF may have to include a parameter during the provisioning.

Figure G.5-9A illustrates the LIPF logic for additional STIR/SHAKEN related provisioning for target non-local ID.

Figure G.5-9A: LIPF logic for additional STIR/SHAKEN related provisioning for target non-local ID

For STIR/SHAKEN related reporting IBCF, AS, P-CSCF (VPLMN with LBO), LMISF-IRI-POI (VPLMN with HR) provide the IRI-POI functions. The LIPF logic shown in figure G.5-9A is additional logic required to support the STIR/SHAKEN when the target is non-local ID.

As illustrated in figure G.5-8, the IRI-POIs in P-CSCF, LMISF-IRI are provisioned as part IMS-based voice LI. Likewise, the IRI-POI in IBCF is also provisioned for IMS-based voice LI when default option is used in HPLMN, or when alternate options are used in both HPLMN and VPLMN.

When the interception of STIR/SHAKEN is required in the network, the IRI-POIs in IBCF and AS are to be provisioned with ReportDiversionPASSporTInfo value.