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