title: performs a NAPTR query
body: <p>This may look like a very simple question, but I haven't found the answer on the Internet.</p>
  
  <p>Anyone can give me clues how to performs a NAPTR query for a SIP domain? (this is mostly for DNS lookup), or any references also great for me (This one exist on rfc2915).</p>
  
  <p>Maybe using terminal or any tools maybe and further i'd like to do it using java so if any piece of code will very helpful.</p>