Encoding IP packets to sound?

Question

Computer networks

In many places, the Internet is not available from the word at all, but you can call a GSM phone. In search of a solution to this problem, I remembered that computers used to run on audio cassettes. That is, the data was encoded into sound and then decoded by the computer.
And then an idea came to my mind - you can encode IP packets into a sound of different tonality and transmit them through a regular GSM call. At the other end, decode them. It turns out, as it were, tunnel over voice.

Is it possible to do this and is there ready-made software on this topic?

Answer 1

Congratulations, you have invented the modem.
It was present in some old mobile phones and allowed you to do exactly what you want.
It is important to understand the difference between a GSM modem, GPRS, 3G and 4G. Data in the voice channel transmits only the first of the list.
You can
-buy it as a separate device
-buy it as part of an old cell phone
-make it even from a modern phone, wires for a headset and a modem | modem emulation software

Answer 2

You may be interested in the D-Modem project:
https://github.com/AonCyberLabs/D-Modem
https://opennet.ru/56070/

Answer 3

Where the Internet is not available, you can usually get out of the situation with GSM amplifiers ...

Answer 4

And then an idea came to my mind - you can encode IP packets into a sound of different tonality and transmit them through a regular GSM call. At the other end, decode them. It turns out, as it were, tunnel over voice.

No, you can't, because in mobile communication, the sound is highly compressed and fragmented.