SIP/2.0 401 Unauthorized Via: SIP/2.0/UDP nm;rport=26810;received=224.161.245.238;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="1743411176/f5f6d145f64b26fee671a02937fa7354",opaque="54a9bea5342398ca",algorithm=MD5,qop="auth" Server: FPBX-17.0.19.23(21.6.0) Content-Length: 0
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