SIP/2.0 401 Unauthorized
Via: SIP/2.0/UDP nm;rport=26810;received=224.198.49.132;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="1715814144/3f0ce6f5169d0621886ca1ba01ca5f44",opaque="0cf1f0860e6ad993",algorithm=MD5,qop="auth"
Server: POVODO PBX 1.0.1740
Content-Length: 0
