How to monitor FXO/FXS port status

Hi guys,
I am working with FreePBX 15.0.16.49 and I want to monitor FXO/FXS port status as Busy, Idle…
How can I monitor it?

Thank you so much!

FXS port is simple, it’s just a normal dahdi extension blf. For FXO you can do this hack: How to determine the PSTN line status? is this SLA?

Thank you!

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