I think even with PBX you can get details of who called if you call it from the PBX system itself. Somewhere there's a direct connection to the outside world, and while I don't know much about PBX systems, I imagine they have some ability to run diagnostics or make a direct call. Most modern PBX systems have Caller ID support, too.
In my childhood years (10-ish) my friend coaxed me into prank calling. We stopped after one of them called back and bluffed that they were going to get the FBI involved if we continued. It worked for us, since we were so young. Hopefully you aren't dealing with immature adults who might call your bluff.
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Fucking crank callers
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