SIP/2.0 403 SIP request not received from active SIP server Via: SIP/2.0/UDP nm;branch=foo;rport From: <sip:nm@nm>;tag=root To: <sip:nm2@nm2>;tag=b72e12N26679fd696-3c285612 Call-ID: 50000 CSeq: 42 OPTIONS Content-Length: 0
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