title: sip making a call - 401 Unauthorized
body: <p>I am working on a sip client. I'm monitoring with wireshark the sip packets.</p>
  
  <p>Register with the sip server works fine</p>
  
  <p>When making a call I have this:</p>
  
  <p>Client - INVITE message
  Server - 401 UNAUTHORIZED
  Client - INVITE message
  Server - 403 Forbidden</p>
  
  <p>I do not have access to the server. What could go wrong? Why can't I make a call?</p>
  
  <p>What is with that 401 and than 403 if registered worked ok?</p>