What services allow you to make a call from the site?

Question

Telephony

It is necessary that when you press the button, a call to a specific number starts.
The user answered and the automatically recorded message was played to him.
Next, he pressed buttons 1 or 2 as the answers to the question and I was able to get the values ​​​​of what he pressed.
Also if he did not answer the call, then I got a certain status about it.
Tell me, please, with the help of which I can implement such functionality and what should I read about. Thanks

Answer 1

This is done using virtual telephony. There are enough providers - mango, comagic, ...