anchor.diff:                          Opaque -> ?call_notice("received invalid nonce", []);
                           _ -> ok
                       end,
  -                    not_found;
  +                    invalid;
                   Method=='ACK' orelse Found=={Ip, Port} ->
                       CNonce = nksip_lib:get_value(cnonce, AuthHeader),
                       Nc = nksip_lib:get_value(nc, AuthHeader),
  
positive.code:             ?notice(AppId, CallId, 
                      "received invalid parameters in Authorization Header: ~p", 
                      [AuthHeader]),
              not_found;
          false ->
              % Should we check the uri in the authdata matches the ruri of the request?
              Uri = nksip_lib:get_value(uri, AuthHeader),
  
negative.code: %% @private
  -spec check_auth_header(nksip:optslist(), binary(), binary(), binary(), 
                              binary(), nksip:request()) -> 
      true | invalid | false.
  
  check_auth_header(AuthHeader, Resp, User, Realm, Pass, Req) ->
      #sipmsg{
  