SIP/2.0 200 OK Supported: 100rel,timer From: <sip:nm@nm>;tag=root To: <sip:nm2@nm2>;tag=A418324631353641101CC401 Call-ID: 50000 CSeq: 42 OPTIONS Server: NEC SL2100/2.1 Via: SIP/2.0/UDP nm;branch=foo;rport=26810;received=224.142.19.19 Content-Length: 0
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