OPTIONS sip:167.235.216.160 SIP/2.0

Via: SIP/2.0/TCP 185.247.137.15:5060;rport;branch=z9hG4bKftqdvnfn

Max-Forwards: 0

To: sip:167.235.216.160

From: sip:185.247.137.15;tag=ftqdvnfn

Call-ID: ftqdvnfn

CSeq: 1 OPTIONS

Accept: application/sdp

Content-Length: 0