Respond to Incoming Phone Calls

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from flask import Flask
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from twilio.twiml.voice_response import VoiceResponse
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app = Flask(__name__)
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@app.route("/voice", methods=['GET', 'POST'])
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def voice():
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    """Respond to incoming phone calls with a 'Hello world' message"""
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    # Start our TwiML response
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    resp = VoiceResponse()
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    # Read a message aloud to the caller
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    resp.say("Hello world!")
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    return str(resp)
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if __name__ == "__main__":
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    app.run(debug=True)

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const express = require('express');
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const VoiceResponse = require('twilio').twiml.VoiceResponse;
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const app = express();
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// Create a route that will handle Twilio webhook requests, sent as an
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// HTTP POST to /voice in our application
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app.post('/voice', (request, response) => {
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  // Use the Twilio Node.js SDK to build an XML response
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  const twiml = new VoiceResponse();
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  twiml.say('Hello world!');
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  // Render the response as XML in reply to the webhook request
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  response.type('text/xml');
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  response.send(twiml.toString());
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});
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// Create an HTTP server and listen for requests on port 3000
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app.listen(3000, () => {
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  console.log(
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    'Now listening on port 3000. ' +
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      'Be sure to restart when you make code changes!'
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  );
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});

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<?php
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// Get the PHP helper library from https://twilio.com/docs/libraries/php
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// this line loads the library 
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require_once '/path/to/vendor/autoload.php';
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use Twilio\TwiML\VoiceResponse;
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$response = new VoiceResponse;
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$response->say("Hello world!");
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print $response;

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// In Package Manager, run:
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// Install-Package Twilio.AspNet.Mvc -DependencyVersion HighestMinor
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using System.Web.Mvc;
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using Twilio.AspNet.Mvc;
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using Twilio.TwiML;
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public class VoiceController : TwilioController
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{
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    [HttpPost]
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    public ActionResult Index()
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    {
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        var response = new VoiceResponse();
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        response.Say("Hello world!");
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        return TwiML(response);
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    }
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}

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import java.io.IOException;
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import javax.servlet.ServletException;
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import javax.servlet.annotation.WebServlet;
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import javax.servlet.http.HttpServlet;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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import com.twilio.twiml.voice.Say;
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import com.twilio.twiml.TwiMLException;
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import com.twilio.twiml.VoiceResponse;
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@SuppressWarnings("serial")
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@WebServlet("/voice")
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public class IncomingCallServlet extends HttpServlet {
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  // Handle HTTP POST to /voice
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  protected void doPost(HttpServletRequest request, HttpServletResponse response)
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    throws ServletException, IOException {
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    Say say = new Say.Builder("Hello world!").build();
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    VoiceResponse twiml = new VoiceResponse.Builder().say(say).build();
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    // Render TwiML as XML
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    response.setContentType("text/xml");
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    try {
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      response.getWriter().print(twiml.toXml());
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    } catch (TwiMLException e) {
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      e.printStackTrace();
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    }
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  }
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}

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# Get twilio-ruby from twilio.com/docs/ruby/install
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require 'sinatra'
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require 'twilio-ruby'
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post '/twiml' do
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  # Start our TwiML response
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  Twilio::TwiML::VoiceResponse.new do |r|
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    # Use <Say> to give the caller some instructions
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    r.say(message: 'Hello world!')
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  end.to_s
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end

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from flask import Flask, request
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from twilio.twiml.voice_response import VoiceResponse
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app = Flask(__name__)
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@app.route("/voice", methods=['GET', 'POST'])
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def voice():
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    """Respond to incoming phone calls and mention the caller's city"""
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    # Get the caller's city from Twilio's request to our app
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    city = request.values['FromCity']
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    # Start our TwiML response
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    resp = VoiceResponse()
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    # Read a message aloud to the caller
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    resp.say('Never gonna give you up, {}!'.format(city))
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    # Play an audio file for the caller
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    resp.play('https://demo.twilio.com/docs/classic.mp3')
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    return str(resp)
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if __name__ == "__main__":
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    app.run(debug=True)

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const express = require('express');
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const VoiceResponse = require('twilio').twiml.VoiceResponse;
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const urlencoded = require('body-parser').urlencoded;
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const app = express();
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// Parse incoming POST params with Express middleware
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app.use(urlencoded({ extended: false }));
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// Create a route that will handle Twilio webhook requests, sent as an
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// HTTP POST to /voice in our application
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app.post('/voice', (request, response) => {
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  // Get information about the incoming call, like the city associated
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  // with the phone number (if Twilio can discover it)
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  const city = request.body.FromCity;
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  // Use the Twilio Node.js SDK to build an XML response
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  const twiml = new VoiceResponse();
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  twiml.say(`Never gonna give you up ${city}.`);
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  twiml.play({}, 'https://demo.twilio.com/docs/classic.mp3');
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  // Render the response as XML in reply to the webhook request
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  response.type('text/xml');
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  response.send(twiml.toString());
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});
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// Create an HTTP server and listen for requests on port 3000
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app.listen(3000);

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<?php
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require_once './vendor/autoload.php';
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use Twilio\TwiML\VoiceResponse;
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$city = $_REQUEST['FromCity'] ?? 'Guayaquil';
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$response = new VoiceResponse();
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$response->say("Never gonna give you up, {$city}!");
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$response->play("https://demo.twilio.com/docs/classic.mp3");
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echo $response;

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// In Package Manager, run:
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// Install-Package Twilio.AspNet.Mvc -DependencyVersion HighestMinor
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using System.Web.Mvc;
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using Twilio.AspNet.Mvc;
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using Twilio.TwiML;
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public class VoiceController : TwilioController
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{
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    [HttpPost]
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    public ActionResult Index(string fromCity)
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    {
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        // Get information about the incoming call, like the city associated
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        // with the phone number (if Twilio can discover it)
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        var city = fromCity;
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        var response = new VoiceResponse();
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        response.Say($"Never gonna give you up {city}");
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        response.Play("https://demo.twilio.com/docs/classic.mp3");
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        return TwiML(response)
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    }
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}

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import java.io.IOException;
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import javax.servlet.ServletException;
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import javax.servlet.annotation.WebServlet;
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import javax.servlet.http.HttpServlet;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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import com.twilio.twiml.voice.Play;
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import com.twilio.twiml.voice.Say;
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import com.twilio.twiml.TwiMLException;
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import com.twilio.twiml.VoiceResponse;
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@SuppressWarnings("serial")
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@WebServlet("/voice")
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public class IncomingCallServlet extends HttpServlet {
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  // Handle HTTP POST to /voice
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  protected void doPost(HttpServletRequest request, HttpServletResponse response)
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      throws ServletException, IOException {
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    // Get the city from the incoming call (if available)
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    String fromCity = request.getParameter("FromCity");
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    if (fromCity == null) {
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      fromCity = "home slice";
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    }
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    Say say = new Say.Builder(String.format("Never gonna give you up, %s!", fromCity)).build();
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    Play play = new Play.Builder("https://demo.twilio.com/docs/classic.mp3").build();
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    VoiceResponse response = new VoiceResponse.Builder().say(say).play(play).build();
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    // Render TwiML as XML
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    response.setContentType("text/xml");
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    try {
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      response.getWriter().print(twiml.toXml());
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    } catch (TwiMLException e) {
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      e.printStackTrace();
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    }
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  }
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}

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# Get twilio-ruby from twilio.com/docs/ruby/install
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require 'sinatra'
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require 'twilio-ruby'
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post '/voice' do
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  city = params['FromCity']
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  # Start our TwiML response
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  Twilio::TwiML::VoiceResponse.new do |r|
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    # Use <Say> to give the caller some instructions
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    r.say("Never gonna give you up #{city}.")
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    r.play(url: 'https://demo.twilio.com/docs/classic.mp3')
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  end.to_s
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end