eli5: The “handshake” between dial-up modems and why it made those sounds

Question

eli5: The “handshake” between dial-up modems and why it made those sounds

In: 294

Answer 1

For more fun about sound and old landline telephone, [here](https://youtu.be/4tHyZdtXULw) is a fun little 30 minute video about “phone phreaking.”