Tracking down nefarious international calls

Over the weekend I received an alert from my provider saying we’d hit the limit on daily international calling cost. I purposely set this very low so no major disaster.

I do need to track down how this happened though. The sip provider shows several calls over about an hour period. I can only really find one call in the FreePBX CDR’s though and expanding that call log reads like stereo instructions to me.

Can anyone offer some guidance on how to trace down from the FreePBX/Asterisk side who did what?

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