SIP/2.0 401 Unauthorized Via: SIP/2.0/UDP nm;rport=26810;received=224.44.109.174;branch=foo Call-ID: 50000 From: <sip:nm@nm>;tag=root To: <sip:nm2@nm2>;tag=foo CSeq: 42 OPTIONS WWW-Authenticate: Digest realm="asterisk",nonce="1737710855/2dc596fed258e7c8eb33767311f9ab97",opaque="44566fba17d373aa",algorithm=md5,qop="auth" Server: FPBX-13.0.197.31(13.17.0) Content-Length: 0
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