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This is referred to as tromboning. you can read more about anti-tromboning here
This is going to depend greatly on your hardware and your configuration. So I can't provide an exact answer for you, you could certainly run a test and trace the call to see if it's pinning up multiple channels.
The rule of thumb... if the call terminates on your system and then leaves your system again, it will be tromboned. If the call hasn't received answer supervision it can be routed through the network or pulled back to the origin point for re-routing.