Example: SCCP connection with GTT
SCCP
SCCP
STP
STP
MSC/VLR located in Espoo
HLR located in Oslo
STP
SPC = 82
SPC = 99
SPC = 32
No SCCP functionality
SCCP functionality
Outgoing message:
OPC = 82  DPC = 32
SCCP: IMSI global title
Processing in STP:
Received message is given to SCCP for GTT. SCCP finds the DPC of the HLR:  DPC = 99