| Typical
call-related IN procedure (1) |
| 3. |
| SCP |
| 2. |
| 4. |
| SSP |
| 1. |
| 5. |
| Exchange |
| Exchange |
| 1. Call routing proceeds up to Exchange |
| 2. Trigger activated in Basic Call State
Model at SSP |
| 3. SSP requests information from SCP
(database) |
| 4. SCP provides information |
| 5. Call routing continues (routing to next
exchange) |