OPTIONS sip:167.235.216.160 SIP/2.0

Via: SIP/2.0/TCP 87.236.176.184:5060;rport;branch=z9hG4bKtaaukmqg

Max-Forwards: 0

To: sip:167.235.216.160

From: sip:87.236.176.184;tag=taaukmqg

Call-ID: taaukmqg

CSeq: 1 OPTIONS

Accept: application/sdp

Content-Length: 0