FPBX-16.0.40.7(16.25.3)

SIP/2.0 401 Unauthorized
Via: SIP/2.0/UDP nm;rport=26810;received=224.90.170.222;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="1715453379/462223603022bc62319652befd313de7",opaque="713ebdb97d9831b8",algorithm=md5,qop="auth"
Server: FPBX-16.0.40.7(16.25.3)
Content-Length:  0