"very interesting phil,but not quite as simple as you put it,optus is the singapore telephone company it does have its own exchanges in telstra exchanges"
Optus has it's own exchanges for it's cable network. In it's own buildings.
Here's one: http://wikimapia.org/14532944/Optus-Mascot-Exchange
"and it does not have a national network of its own,it leases from quess who"
It leases capacity from several companies, but it also owns it's own inter-capital and international links. stoz posted a diagram earlier.
"very interesting phil,but not quite as simple as you put...
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