method sip:user@remote SIP/2.0
CSeq: cseq method
Max-Forwards: 70
User-Agent: agent
Contact: sip:user@remote
Accept: application/sdp
Content-Length: 0 
Via: SIP/2.0/UDP host:portudp;branch=z9hG4bK78adb2cd-0671-e011-81a1-a1816009ca7a;rport
From:  "display" <sip:localUSER@remote>;tag=642d29cd-0671-e011-81a1-a1816009ca7a
Call-ID: user
To: <sip:user@remote>

