SIP/2.0 404 Not Found
From: <sip:nm@nm>;tag=root
To: <sip:nm2@nm2>;tag=aea058-974db70f-13c4-5506-14fa6-6b23ad8f-14fa6
Call-ID: 50000
CSeq: 42 OPTIONS
User-Agent: DLink VoIP Stack
Supported: replaces,timer,100rel
Via: SIP/2.0/UDP nm;received=224.52.190.229;rport=26810;branch=foo
Content-Length: 0
