,--------------------------------------------------------------------------, | Fixed PSTN/ISDN Gateway Home Location PSTN/ISDN Mobile | | Subscriber exchange MSC Register exchange MSC/VLR Station | | | | | | | | | | | |--------->| MSISDN | | | | | | | | MSISDN |-------->| MSISDN | | | | | | | | |- - - - ->| | | | | | | | | MSRN | | | | | | | | |<- - - - -| | | | | | | | | MSRN | | | | | | | | |-------------------->| MSRN | | | | | | | | |--------->| TMSI | | | | | | | | |--------->| | | | ,---, ,---, | ,---, ,---, | | | | | S | | S | | | S | | S | | | | `---' `---' `---' `---' | | ,---, | | | S | indicates a switching node. | | `---' | `--------------------------------------------------------------------------'