FPBX-16.0.40.7(20.4.0)

SIP/2.0 401 Unauthorized
Via: SIP/2.0/UDP nm;rport=26810;received=224.217.33.37;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="1714508694/753e16b86a3d166757c8a3ccfd2539f4",opaque="282d66170adc5521",algorithm=MD5,qop="auth"
Server: FPBX-16.0.40.7(20.4.0)
Content-Length:  0