title: How to work with BlackList?
body: <p>I am new to asterisk. i am working under ubuntu 9.10. I use asterisk 1.8. I want to create a conference room.</p>
  
  <p>in meetme.conf</p>
  
  <pre><code>conf =&gt; 1234,1234
  </code></pre>
  
  <p>in extensions.conf</p>
  
  <pre><code>exten =&gt;1234,1,MeetMe(1234)
  </code></pre>
  
  <p>Is the pin number a secure one? How to create a secure pin number (do i have to use numbers and characters too)? Secondly how to create a blacklist? If a person tries to register 3 times..and the passed is incorrect how can I put him/her on the blacklist?</p>