SIP/2.0 200 OK
Via: SIP/2.0/UDP nm;branch=foo;rport=26810;received=224.13.234.167
From: <sip:nm@nm>;tag=root
To: <sip:nm2@nm2>;tag=6rej1r81yUZgF
Call-ID: 50000
CSeq: 42 OPTIONS
Contact: <sip:116.196.112.214>
User-Agent: JrtcConnector
Accept: application/sdp
Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, INFO, UPDATE, REGISTER, REFER, NOTIFY
Supported: timer, path, replaces
Allow-Events: talk, hold, conference, refer
Content-Length: 0

HTTP/1.1 404 Not Found
Content-Length: 0
Keep-Alive: timeout=5, max=5