I have examined VOIP-related crimes, and I have come to the conclusion
   they did not happen. If they did happen, a sane policy would be in
   place. (I have come to similar conclusions regarding Bin Laden, we
   never expelled any Pakistani diplomats)
   When you ship alcohol, many states require showing ID proving the
   recipient is of legal age. When you order an OVH server, they require
   ID. For Chinamen, they require a deposit.
   [1]http://spitfirelist.com/news/school-shootings-are-technologically-ob
   solete/
   Klinger said that Internet-based organizations charged the equivalent
   of $50 in bitcoins to create a bomb scare using automated phone calls,
   which account for 13 percent of all threats, according to her school
   security research.
   [2]http://dailycaller.com/2017/06/03/bernie-backers-say-wasserman-schul
   tz-interfered-with-suit-she-says-it-was-another-cyberattack/
   Defendants are very concerned that this was a ‘spoofing’ incident,
   whereby a caller unaffiliated with the Congresswoman or her office,
   used one of any number of means to place a call that would appear, on
   the recipient’s caller ID, to be coming from that office.
   [3]https://www.theatlantic.com/technology/archive/2016/12/cuban-telepho
   ne-fraud/509006/
   Well... to summarize this link concisely, basically international VOIP
   companies are violating common carrier rules and are spoofing recipient
   numbers with voice readings of books.
   Now there is of course another possibility. The police enjoy
   investigating things they can't solve, they have too many resources.
   Erm. Now if they spend this much time investigating things that they
   can't solve, couldn't they take a step further and petition their
   representatives to make their jobs easier?
   Clearly VOIP-related crimes did not happen. Is it so hard to code it so
   that if you call a number, you end up with "The number you have dialed
   is registered with a service that is prohibited from operating an
   interstate VOIP service in the United States."
   The illegality of some VOIP activities, I mean, there's nothing
   comparable to that of other common carriers.
   A congresswoman was the victim of a VOIP-related crime. No one has
   written a law.
   What will it take for anyone to notice anything wrong?

References

   1. http://spitfirelist.com/news/school-shootings-are-technologically-obsolete/
   2. http://dailycaller.com/2017/06/03/bernie-backers-say-wasserman-schultz-interfered-with-suit-she-says-it-was-another-cyberattack/
   3. https://www.theatlantic.com/technology/archive/2016/12/cuban-telephone-fraud/509006/