RE: The FXO as PSTN Pass-Through Port
As I understand it, yes, but it's not a "pass through" port. Basically your FXO port is treated as another VoIP destination, i.e. you can route certain calls to it. It just so happens that VoIP destination terminates on your attached PSTN line.
In the event of a power outage, your FXS port connects to your FXO port, so I guess in that sense, it is a pass through port.
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