Dial-up data transfer....

Hello lads... ;D...!
Another of those fascinating questions which keep the curious amongst us awake at nights...>>>
I am one of the lucky? few who still uses dial-up to connect to the Internet....
...!
So...
My question is...
After I dial my Service Provider's number on my computer, a stream of data is exchanged, which can be heard from my Modems's speaker...
...!
Now, is this data being sent from my computer to my ISP, or the other way round, from my ISP to my computer...?
And...
Does anyone know exactly what information this data contains...?
Pablo The Curious.....who needs a good nights sleep...
...
...
...!
LOL...!
Another of those fascinating questions which keep the curious amongst us awake at nights...>>>
I am one of the lucky? few who still uses dial-up to connect to the Internet....

So...
My question is...
After I dial my Service Provider's number on my computer, a stream of data is exchanged, which can be heard from my Modems's speaker...

Now, is this data being sent from my computer to my ISP, or the other way round, from my ISP to my computer...?
And...
Does anyone know exactly what information this data contains...?
Pablo The Curious.....who needs a good nights sleep...



LOL...!