OPTIONS sip:104.225.216.129:9999 SIP/2.0
Via: SIP/2.0/TCP 104.225.216.129:9999;branch=z9hG4bK0654350e
Max-Forwards: 70
From: <sip:scanner@104.225.216.129>;tag=0654350e
To: <sip:104.225.216.129:9999>
Call-ID: 0654350e@104.225.216.129
CSeq: 1 OPTIONS
Contact: <sip:scanner@104.225.216.129:9999>
Accept: application/sdp
Content-Length: 0