/** Handle incoming response here */
  public void notifyResponse(SipClientConnection scc) {
    int statusCode = 0;
    boolean received = false;
    try {
      scc.receive(0); // <i><b>fetch resent response</b></i>
      statusCode = scc.getStatusCode();
      str = new StringItem("Response: ", statusCode + " " + scc.getReasonPhrase());
      form.append(str);
      if (statusCode < 200) {
        dialog = scc.getDialog();
        form.append("Early-Dialog state: " + dialog.getState());
      }
      if (statusCode == 200) {
        String contentType = scc.getHeader("Content-Type");
        String contentLength = scc.getHeader("Content-Length");
        int length = Integer.parseInt(contentLength);
        if (contentType.equals("application/sdp")) {
          //
          // <i><b>handle SDP here</b></i>
          //
        }
        dialog = scc.getDialog(); // <i><b>save dialog info</b></i>
        form.append("Dialog state: " + dialog.getState());

        scc.initAck(); // <i><b>initialize and send ACK</b></i>
        scc.send();
        str = new StringItem("Session established: ", scc.getHeader("Call-ID"));
        form.append(str);
        scc.close();
      } else if (statusCode >= 300) {
        str = new StringItem("Session failed: ", scc.getHeader("Call-ID"));
        form.append(str);
        form.removeCommand(byeCmd);
        form.addCommand(restartCmd);
        scc.close();
      }
    } catch (IOException ioe) {
      // <i><b>handle e.g. transaction timeout here</b></i>
      str = new StringItem("No answer: ", ioe.getMessage());
      form.append(str);
      form.removeCommand(byeCmd);
      form.addCommand(restartCmd);
    }
  }
 private void startSession() {
   SipClientConnection scc = null;
   try {
     // <i><b>start a listener for incoming requests</b></i>
     startListener();
     // <i><b>open SIP connection with remote user</b></i>
     scc = (SipClientConnection) Connector.open(address.getString());
     scc.setListener(this);
     // <i><b>initialize INVITE request</b></i>
     scc.initRequest("INVITE", scn);
     scc.setHeader("Content-Length", "" + sdp.length());
     scc.setHeader("Content-Type", "application/sdp");
     OutputStream os = scc.openContentOutputStream();
     os.write(sdp.getBytes());
     os.close(); // <i><b>close and send</b></i>
     str = new StringItem("Inviting... ", scc.getHeader("To"));
     form.append(str);
   } catch (Exception ex) {
     ex.printStackTrace();
     // <i><b>handle IOException</b></i>
   }
 }