Twilio respond to keypress during voice call
<p>I am new to Twilio and to programming in general.</p>

<p>I have a simple Arduino based App running on an ESP8266. Basically it rings an alarm on a scheduled basis, and requires the user to press a button to silence the beeping alarm.
If the alarm beeps 10 times, it then places a voice call from Twilio to a specific number and announces "the alarm is ringing".
Everything is working great to that point.</p>

<p>I would like the voice call to say "The alarm is ringing. Press 1 to silence the alarm." </p>

<p>I have no clue as to how to 'accept' the buttonpress . Everything that I can find seems to be about routing internally within Twilio (forwarding, voicemail, etc), but nothing about Twilio posting a response outside.</p>

<p>Any guidance? Any PHP sample code anywhere that does this kind of thing?</p>