LDAP:
  ErrorMessage: authentication required
  ResultCode: unwillingToPerform

SIP/2.0 200 OK
From: <sip:nm@nm>;tag=root
To: <sip:nm2@nm2>;tag=72ba4060-c27007dd-13c4-50029-18e466-74e906a2-18e466
Call-ID: 50000
CSeq: 42 OPTIONS
Via: SIP/2.0/UDP nm;received=224.192.126.188;rport=26810;branch=foo
Supported: 100rel,replaces
Allow: INVITE,ACK,PRACK,BYE,UPDATE,OPTIONS,CANCEL,REFER,INFO,NOTIFY
Content-Length: 0