<?php
require "twilio.php";

/* Twilio REST API version */
$ApiVersion = "2008-08-01";

/* Set our AccountSid and AuthToken */
$AccountSid = "ACXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX";
$AuthToken = "YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY";

/* Outgoing Caller ID you have previously validated with Twilio */
$CallerID = 'NNNNNNNNNN';

/* Instantiate a new Twilio Rest Client */
$client = new TwilioRestClient($AccountSid, $AuthToken);

/* Validate request */
if (!isset($_REQUEST['number'])) {
    $err = urlencode("Must specify phone number");
    header("Location: .?msg=$err");
    die;
}

if (!isset($_REQUEST['email'])) {
    $err = urlencode("Must specify email address");
    header("Location: .?msg=$err");
    die;
}

if (!eregi('^[a-z0-9_.-]+@([a-z0-9_-]+\.)+[a-z0-9_-]{2,4}$', $_REQUEST['email'])) {
    $err = urlencode("Invalid email address");
    header("Location: .?msg=$err");
    die;
}

/* make Twilio REST request to initiate outgoing call */
$response = $client->request("/$ApiVersion/Accounts/$AccountSid/Calls",
    "POST", array(
        "Caller" => $CallerID,
        "Called" => $_REQUEST['number'],
        "Url" => "http://demo.twilio.com/voicemailtranscribe/makerecording.php?email=".urlencode($_REQUEST['email'])
    ));
if($response->IsError) {
    $err = urlencode($response->ErrorMessage);
    header("Location: .?msg=$err");
    die;
}

/* redirect back to the main page with CallSid */
$msg = urlencode("Calling... ".$_REQUEST['number']);
header("Location: .?msg=$msg&CallSid=".
    $response->ResponseXml->Call->Sid);

?>