Closest thing to this, was a number a friend of mine was told about. We called it, and you could hear 100s of people talking, some sort of crossed analog line

Closest thing to this, was a number a friend of mine was told about. We called it, and you could hear 100s of people talking, some sort of crossed analog line issue. This was in the 80s in a very rural area. Anyhow I remember everyone having fun, yelling at everyone else to be heard, but also, a few people really mad. It seemed like some people wanted to make a phone call, everyone else was just having fun. A few days later it vanished, probably to the happiness of those lines directly affected.