Why did the dial up modem noise sound the same every time? What was the purpose of those sounds as the connection was being made?

Question

I understand that modems used the telephone line to transmit and decode sound into data, but I don’t understand why that noise everyone remembers needed to happen. You didn’t hear sound when you were loading a web page even though sound was being decoded by you modem… what was the purpose for it on start-up?

Edit: Autocorrect typo

In: Technology

Answer 1

All the different parts of it have a definite purpose. It’s the two modems at each end figuring out what each others causalities are and how good the line is.

The best description I ever saw [is visual…](https://oona.windytan.com/posters/dialup-final.png)