Voice AI

from flask import Flask
from twilio.twiml.voice_response import VoiceResponse
app = Flask(__name__)

@app.route("/answer", methods=['GET', 'POST'])
def answer_call():
    resp = VoiceResponse()
    resp.say("Twilio's always there when you call!")
    return str(resp)

if __name__ == "__main__":
    app.run()

using Microsoft.AspNetCore.Mvc;
using Twilio.TwiML;

[ApiController]
public class VoiceController : Controller
{
    [HttpPost]
    [Route("answer")]
    public IActionResult Answer()
    {
        var response = new VoiceResponse();
        response.Say("Twilio's always there when you call!");

        return Content(response.ToString(), "text/xml");
    }
}

@RestController
public class VoiceController {

    @RequestMapping(value = "/answer", method = {RequestMethod.GET, RequestMethod.POST})
    public String answer() {
        VoiceResponse response = new VoiceResponse.Builder()
                .say(new Say.Builder("Twilio's always there when you call!").build())
                .build();

        return response.toXml();
    }
}

<?php

use Twilio\TwiML\VoiceResponse;

$response = new VoiceResponse();
$response->say("Twilio's always there when you call!");

header("Content-Type: text/xml");
echo $response;

require 'sinatra'
require 'twilio-ruby'

post '/answer' do
  response = Twilio::TwiML::VoiceResponse.new do |r|
    r.say(message: "Twilio's always there when you call!")
  end

  content_type 'text/xml'
  response.to_s
end

curl -X POST http://localhost:3000/answer