SIP/2.0 404 Not Found Via: SIP/2.0/UDP nm;branch=foo;rport=26810;received=224.56.170.160 From: <sip:nm@nm>;tag=root To: <sip:nm2@nm2>;tag=CE4FAFE7C28E06F8 Call-ID: 50000 CSeq: 42 OPTIONS User-Agent: FRITZ!OS Content-Length: 0
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