SIP/2.0 200 OK
Via: SIP/2.0/UDP nm;branch=foo;rport=26810;received=224.212.212.228
From: <sip:nm@nm>;tag=root
To: <sip:nm2@nm2>;tag=1293588047
Call-ID: 50000
CSeq: 42 OPTIONS
Allow: INVITE, ACK, OPTIONS, PRACK, NOTIFY, BYE, CANCEL, REGISTER, INFO, UPDATE, MESSAGE
User-Agent: EasyBox 803 S-286524-3.28.2.29
Supported: 100rel
Content-Length: 0
