title: Can't receive deliver_sm (SMPP)
body: <p>I'm sending SMS by PHP, SMPP protocol and must use Net_SMPP library. After sending SMS (it comes to phone normally) I need to receive answer (deliver_sm PDU from SMSC). But listening of it hasn't take effect. My reciver's code:</p>
  
  <pre><code>$host = '*********';
  $port = '****';
  $login = '*****';
  $password = '*******';
  
  /*
   * There is sending of SMS
  */
  
  $smsc = new Net_SMPP_Client($host, $port);
  $smsc-&gt;connect();
  
  $resp = $smsc-&gt;bind(
    array(
        'system_id' =&gt; $login,
        'password' =&gt; $password,
        'addr_ton' =&gt; NET_SMPP_TON_INTL,
        'addr_npi' =&gt; NET_SMPP_NPI_ISDN,         
        'system_type' =&gt; ''
    ), 
    $typeBind
  );
  
  if (!is_object($resp) || $resp-&gt;isError()) {
    die('CANNOT BIND');
  }
  
  $resp = $smsc-&gt;readPDU();
  if (is_object($resp) &amp;&amp; !$resp-&gt;isError()) {
      //This is needble point 
  }
  </code></pre>
  
  <p>SMS-provider says that he'd sent deliver_sm and my script responded deliver_sm_resp with error "ESME receiver temporary app error code" (errcode 0x00000064).</p>
  
  <p>Intresting that after sending SMS to special "gate"-number deliver_sm will <strong>normally</strong> come to me and handle by my script.</p>
  
  <p>What did I go wrong? Help me please! Or say me if any other info needs for solving. </p>