title: Python pjsua - How to create a custom message?
body: <p>I'm using pjsua python module, and I don't know how to create a custom message like below:</p>
  
  <pre><code>mY'0E@@b,%+&amp;KEEPALIVE sip:user@192.168.0.10 SIP/2.0
  Via: SIP/2.0/UDP 192.168.0.10;rport;branch=z9hG4bKPjgdQdo8azxxwRZ9aCVJy5Wdr27fTgDBUy
  Max-Forwards: 70
  From: &lt;sip:user@192.168.0.10&gt;;tag=w0na7ZUHDVaB8QG38EGdH5f23W3fzKL6
  To: &lt;sip:server@192.168.0.10&gt;
  Contact: &lt;sip:server@192.168.0.10&gt;
  Call-ID: -TtcAtmNnJM5uteQDgMmddoWx7IM1fDP
  CSeq: 1 KEEPALIVE
  Applier-ID: 24598
  Expires: 2147483647
  User-Agent: PU/1.0.0
  Content-Length:  0
  </code></pre>
  
  <p>Obs: The server and client are in the same PC.</p>
  
  <p>Exists any way to do this? Thanks.</p>