XMPP.php类不起作用

I am using XMPP.php (i.e XMPP Class) to create a chat application in GTalk. i have put the correct username and password of Gtalk but it is not working. the code i used (got it from GitHub.com)

<?php

  include 'XMPP.php';

  #Use XMPPHP_Log::LEVEL_VERBOSE to get more logging for error reports
  #If this doesn't work, are you running 64-bit PHP with < 5.2.6?
  $conn = new XMPPHP_XMPP('talk.google.com', 5222, 'username', 'pass', 'xmpphp', 'gmail.com',       $printlog=false, $loglevel=XMPPHP_Log::LEVEL_INFO);

try {
echo "Welcome 2 ";
$conn->connect(100, false, true);
$conn->processUntil('session_start');
$conn->presence();
$conn->message('someid@somewere.com', 'This is a test message!');
$conn->disconnect();
} catch(XMPPHP_Exception $e) {
echo "Fail";
die($e->getMessage());
}

?>

and the error (exception) i am getting is

Welcome 2 Fail Could not connect before timeout.

i am using unix based webserver, is there any software needed to run Chatserver or something like that... please help!

Generally the problem should disappear after increasing timeout value. Alternately, try out Jaxl library http://github.com/abhinavsingh/JAXL in case you are still facing the same problem ....