title: PJsip Extract the value of header from a sip method
body: <pre><code>  NOTIFY sip:98901@xx.xx.xx.xx SIP/2.0
      To: sip:98901@xx.xx.xx.xx:1234
      From: sip:sipsak@xx.xx.xx.xx
      CSeq: 1 NOTIFY
      Call-ID:1234
      Event: check-sync;reboot=false
  </code></pre>
  
  <p>I want to Extract event header with the connected string check-sync;reboot=false</p>