| Signalling
in GSM core network |
|
|
| ISUP for signalling
between exchanges (MSC, GMSC) |
|
| MAP for
signalling to/from databases (VLR, HLR, AuC, EIR) |
|
|
|
|
|
|
| MM / CM |
||||
| RR |
||||
| BSSMAP / DTAP |
||||
| MAP |
| TCAP |
| MAP |
| SCCP |
| ISUP |
| BSSAP |
| BSSAP |
| TCAP |
| MTP |
| SCCP |
| SCCP |
| SCCP |
| HLR |
| MTP |
| MTP |
|
|
|
| A |
||
| interface |
||
| BSC |
| MSC / VLR |
| to GMSC |