I made these calls when I was probably 14 or 15 with a friend of mine back around 2003. I burned it to CD along with a bunch of other calls and passed it around my high school. They were popular because people at the school knew the people we were calling. This one was the dad of someone I went to school with.
This collect call routine was our go to. It consisted of two parts: the initial nonsense "collect call" that usually lasted less than a minute, and then an "automated" followup call that alerted them they were billed an absurd amount of money.