First, it's FXS, not FSX. That may help you out with your research.
The general rule of thumb is an FXO always connects to an FXO on the other side.
Another rule of thumb is this: If you plug in an analog phone to the port, and hear dialtone when you go offhook, then the port you are plugging into is an FXS port.
Some 'paging' systems are simply a PA system or essential an audio power amp (I'm guessing that's the case with your Bogen TPU 100B 100 watt amplifier), and don't do any loop closure when answering the call. Essentially, it's just an audio line-in jack. Those you would typically integrate with an e&m port, or use a device to adapt the PA line-in jack to an FXO/FXS port on the other side.
You can usually look at the spec sheets and find out how the device interfaces, and if the ports are telephony ports or just audio jacks.
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