This sounds familiar!
Several months ago, my cell phone started getting calls from this random number from Tampa, Florida. Every time I answered, it would hang up. I didn't think much of it the first couple times, but it continued calling me three or four times a day for the rest of the week. Eventually, I got a little paranoid and started calling it back. Every time I did, it would ring once, maybe twice and then disconnect me. Sometimes it would say the number was out of service, even seconds after it had called me.
This back and forth continued for another week, probably. One night, I was driving alone in my car, really bored. It was a long drive and it was late, between 12 and 1 a.m. (I live where it's an hour behind Tampa, so it would have been even later there.) I decided to call the number again for the hell of it, hoping I could annoy them and wake them up.
This time, it did half a ring and then cut off. I heard a clicking noise, followed by what sounded like a woman screaming, a whole, whole lot like >>13172770
sounds like. I started freaking the fuck out and threw the phone into the passenger seat like a retard, but it didn't disconnect. After a moment, I put it back to my ear and tried to see if I could decipher what the screaming was. I realized it was a 6-7 second loop that kept playing...and I also became pretty sure the screaming was monkies of some kind. There was one monkey doing low hoots and another doing a high-pitched shriek that sounded like a woman. The loop never stopped, so I eventually hung up.
The next day I tried to show this to my friends but every time I called back, it just disconnected me or said out of service. Later, I got the idea to call after midnight. There were the monkies again. My roommate even got to hear it.
Anyone have any similar experiences or any idea what the fuck happened? I really sorry that can't remember the number. I had forgotten about it until I saw this thread.