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