How is receiving a response (pressing number keys) implemented in phone bots?

Question

Telephony

It is necessary to develop a bot that will call and play the recording. After playing, you need to get feedback with answer options like "Press a number from 0 to 9 or a pound to shut us up." How is getting the value of the pressed number/key generally implemented in bots?

Answer 1

It's called DTMF.
For telephones with pulse dialing (which are shkolota-proof - they can't turn the disc) the technology is practically inaccessible [you can of course use a beeper, but this is already overkill]
In traditional telephony, pressing a key causes a two-tone signal to be generated, which can be clearly recognized at the other end
In VoIP it can be both a two-tone signal and a message transmitted in the synchronization channel.
The largest number of auto attendants that a user currently encounters is Asterisk, which is simply set up.