SIP/2.0 200 OK
From: <sip:nm@nm>;tag=root
To: <sip:nm2@nm2>;tag=8bf5f8-0-13c4-bbde-4ecfefe4-bbde
Call-ID: 50000
CSeq: 42 OPTIONS
Via: SIP/2.0/UDP nm;received=224.208.157.5;rport=26810;branch=foo
Supported: 100rel,replaces,timer,path
Contact: <sip:127.0.0.1:5060>
Content-Length: 0

HTTP/1.1 404 Not Found
Server: gSOAP/2.7
Content-Type: text/xml; charset=utf-8
Content-Length: 460
Connection: close