title: asterisk hide version from nmap scan
body: <p>I'm looking for methods (iptables rules, etc...) to prevent the asterisk version from showing on a nmap udp scan without closing (drop) the port. If I open it for some ip address, a nmap udp scan to port 5060 from this ip address can resolve the asterisk version(<code>nmap -sU -sV -p 5060 &lt;ipaddress&gt;</code>):</p>
  
  <pre><code>PORT     STATE  SERVICE VERSION
  5060/udp open   sip     Asterisk PBX 1.8.13.0
  </code></pre>
  
  <p>Is there some way that only shows port 5060 open? Is it possible to hide this asterisk info or change it?</p>