How to receive and read DTMF response in asterisk

how to receive DTMF response in asterisk?
while background() works, if we detect digits, i have to listen and show the digits result in web page.
to do this, what i have to do in asterisk?

If you read about the background() application, you will learn the secret.

Most of your questions over the last couple of weeks could be answered by reading a good book (‘Asterisk: The Future of Telephony’ for example. It may be a bit dated, but gives a good ‘background’) and working through the examples.

Having a greater understanding of Asterisk will help you choose appropriate solutions and trying examples will lead to a greater understanding of how things work.

For example, in your case where you want to ask a question a couple of times, maybe read() is a better choice than background().

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