| Channel-associated
signalling (CAS) |
| CAS means in-band signalling over voice channels. |
| signalling
possible |
| signalling
not possible (yet) |
| Exchange |
| Exchange |
| Exchange |
| circuit
switched connection |
| CAS has two serious
draw-backs: |
| 1) Setting up a circuit
switched connection is very
slow. |
|
|
|
| 2) Signalling
to/from databases is not
possible (setting |
||
| up a circuit
switched connection to the database would |
||
| be extremely
inconvenient). |
||