| Common
channel signalling (CCS) |
|
|
| In practice,
CCS = SS7 (except maybe North America). |
|
| In Finnish: CCS =
yhteiskanavamerkinanto (YKM) |
|
| signalling
possible anywhere anytime |
| Exchange |
| Exchange |
| Database |
|
|
| The
packet-switched signalling network is separated |
|
| from circuit switched
connections. Consequently: |
|
| 1) Signalling to/from
databases is possible anytime. |
|
|
| 2) End-to-end
signalling is possible before call setup and |
|
| also during the
conversation phase of a call. |
|