12.053GPPSubscriber Related Call and Event DataTS
Figure B.3 illustrates a simple mobile to mobile call from subscriber "A" to subscriber "B" both within the same PLMN.
The originating MSC (MSC-A) shall produce an MOC record for the call to subscriber "B".
Having received a setup request from subscriber "A" (1), MSC-A interrogates the HLR of the called subscriber in order to determine his current location (2). The HLR shall create an HLR interrogation event record.
MSC-A routes the call to the MSC at which subscriber is currently registered (3). This terminating MSC (MSC-B) shall create an MTC record for subscriber "B". If MSC-A and MSC-B are co-located then two records, one MOC and one MTC, shall be produced for this call.
The records generated are subsequently transferred to the OS either immediately following the release of the connection or when collected by the OS.
Figure B.3: Mobile to mobile call