Lawful Interception (LI) implementation guidance; LI for IMS based RCS
The present document provides architectural diagrams, conceptual scenarios, flow-diagrams, examples, and other background information which can be useful to implement the LI functions defined in TS 33.126 [2], TS 33.127 [3] and TS 33.128 [4].
The present document covers the LI for IMS based RCS that include the illustrations covering the architecture topologies and the call flows when the RCS service is offered by the CSP or by a Third Party Provider. The LI for IMS based services are illustrated in TR 33.929-1 [10].
The LI for IMS-based RCS is agnostic to the packet core network.