title: Add SIP header when originating via Asterisk callfile
body: <p>I need a way to add SIP headers when originating a call using an Asterisk callfile.</p>
  
  <p>Is there any way to add SIP header in the call file?</p>
  
  <p>I know I can accomplish this using Asterisk AGI, but I am not able to find any solution to add a SIP header using a call file.</p>