twilio_join_queue_update.php

<?php
  require_once('../Services/Twilio.php');
  $sid = "ACxxxxxxxxxxxxxxx"; // Twilio Account Sid
  $token = "yyyyyyyyyyyyyyy"; // Twilio Auth Token
  
  $client = new Services_Twilio($sid, $token);
  $call = $client->account->calls->get("CAxxxxxxxxxyyyyyyyyyy"); // Call Sid
  $call->update(array(
    "Url" => "http://xxx.xxx.xxx.xxx/join_queue.xml",
    "Method" => "POST"
  ));
  echo $call->sid;