Emergency services providers and others are being hit with telephone-based denial of service attacks. Nasty stuff, powered by IP-based phone systems. This relates to SWATing (what hit Brian Krebs). It has become trivial to use computers to make and spoof phone calls.
This is the sort of thing that could lead to new regulations. It is already against the law, but these incidents may lead to rules tightening how companies connect to the phone system. Which probably isn’t great for innovation, and might not work anyway.