Routing information in SS7 message
Level 3 signalling message in SIF (Signalling Information Field)
SLC
OPC
DPC
MTP management message:
SLC – 4 bit signalling link code
CIC
OPC
DPC
MTP TUP message:
CIC – 12 bit circuit ID code
SLS
OPC
DPC
MTP SCCP message:
SLS – 4 bit signalling link selection
Routing label