SIP/2.0 404 Not Found Via: SIP/2.0/UDP nm;branch=foo;received=224.252.128.184;rport=26810 From: <sip:nm@nm>;tag=root To: <sip:nm2@nm2>;tag=as2f551de1 Call-ID: 50000 CSeq: 42 OPTIONS User-Agent: vos3000 Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO Supported: replaces Accept: application/sdp Content-Length: 0
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