| Signalling
sequence 1 (call setup) |
| User A |
| LE A |
| TE |
| LE B |
| User B |
| Off hook |
|
|
| Local exchange
detects setup |
|
| request and returns dial
tone |
|
| Dial tone |
| B number |
|
|
|
|
|
|
| Local exchange: |
|||||
| analyzes B
number |
|||||
| determines that
call |
|||||
| should be
routed via |
|||||
| transit
exchange (TE) |
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