"I guess this brings up and interesting issue -- once someone knows the ins and outs of a system, sometimes there are very few barriers internally to check that an order/paperwork is legit."

This was a regular narrative from the days of phone phreaking and toll fraud, etc.

Just speaking the correct lingo of a lineman or an operator or a toll office supervisor could allow one to navigate through all the depths of the telephone system. Not just to receive services without charge, but to actually build and teardown circuits, set up test numbers (ANACs), conference calls, etc.

It's incredible to think that a few lines of Twiml, or a Twilio function, can create something like an ANAC which was a rare, valuable, and jealously guarded secret 30 years ago ...