I think I've said this before here but this sucks for individuals (I get these) but this is also dangerous for certain sectors as well. I work at a hospital and we will have consecutive robocalls tie up all the ER lines, ringing at the same time, for anywhere from 5-15 minute periods. I don't work on the telecom side of things but they say all they can do is report it to the FBI. This has been going on since I've worked there (6 months or so) and occurs at least once a month across the entire hospital.