SIP/2.0 401 Unauthorized
Via: SIP/2.0/UDP nm;rport=26810;received=224.70.106.173;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="1726149708/da6083245a7a8ec74699928665bfebe1",opaque="63df260520721b07",algorithm=MD5,qop="auth"
Server: FPBX-17.0.19.5(21.4.1)
Content-Length: 0
