OPTIONS sip:174.138.116.231:9999 SIP/2.0
Via: SIP/2.0/TCP 174.138.116.231:9999;branch=z9hG4bK-1aab74b22e35a4dc
Max-Forwards: 70
To: <sip:174.138.116.231:9999>
From: <sip:174.138.116.231:9999>;tag=71ee4e81e78cfad8
Call-ID: 5f93a0e7c739728e@174.138.116.231:9999
CSeq: 26247 OPTIONS
Content-Length: 0