code: public ArrayList<STUNService> loadSTUNServers(java.io.InputStream stunConfigStream) {
          ArrayList<STUNService> serversList = new ArrayList<>();
          String serverName;
          int serverPort;
  
          try {
              XmlPullParser parser = XmlPullParserFactory.newInstance().newPullParser();
              parser.setFeature(XmlPullParser.FEATURE_PROCESS_NAMESPACES, true);
              parser.setInput(stunConfigStream, "UTF-8");
  
              int eventType = parser.getEventType();
              do {
                  if (eventType == XmlPullParser.START_TAG) {
  
                      // Parse a STUN server definition
                      if (parser.getName().equals("stunServer")) {
  
                          serverName = null;
                          serverPort = -1;
  
                          // Parse the hostname
                          parser.next();
                          parser.next();
                          serverName = parser.nextText();
  
                          // Parse the port
                          parser.next();
                          parser.next();
                          try {
                              serverPort = Integer.parseInt(parser.nextText());
                          }
                          catch (Exception e) {
                          }
  
                          // If we have a valid hostname and port, add
                          // it to the list.
                          if (serverName != null && serverPort != -1) {
                              STUNService service = new STUNService(serverName, serverPort);
  
                              serversList.add(service);
                          }
                      }
                  }
                  eventType = parser.next();
  
              }
              while (eventType != XmlPullParser.END_DOCUMENT);
  
          }
          catch (XmlPullParserException e) {
              LOGGER.log(Level.SEVERE, "Exception", e);
          }
          catch (IOException e) {
              LOGGER.log(Level.SEVERE, "Exception", e);
          }
  
          currentServer = bestSTUNServer(serversList);
  
          return serversList;
      }
docs: Load the STUN configuration from a stream.
  
  @param stunConfigStream An InputStream with the configuration file.
  @return A list of loaded servers