twilioCall.js

if ($("#call").is(':checked')) {
  $.ajax({
    type: "POST",
    username: twilio.username,
    password: twilio.pwd,
    url: twilio.server_url + twilio.username + '/Calls.json',
    data: { Url: <xml-containing-twilio-message>, From: twilio.phone, To: user.phone }
  })
  .done(function( msg ) {
    console.log("Phone call made.");
  });
}