03.333G security3GPPLawful InterceptionStage 2TS
Figures A5 and A6 show the interception of multiparty calls. Figure A5 covers the case where one pair of stublines is used per target, figure A6 covers the case where a pair of stublines is used for each target call. The mobile setting up the multiparty call (A) is the target for interception.
Figure A5: Interception of multiparty calls – stublines per target
Figure A6: Interception of multiparty calls – stublines per target call