anchor.diff:              end;
           {register_expires, Expires} when is_integer(Expires), Expires>0 ->
               [{register_expires, Expires}|Opts];
  -        registrar ->
  +        {registrar, true} ->
               [{registrar, true}|Opts];
           {trace, Trace} when is_boolean(Trace) ->
               [{trace, Trace}|Opts];
  
positive.code:             [{store_trace, Trace}|Opts];
  
          % Unknown options
          {Name, Value} ->
              case nksip_config:parse_config(Name, Value) of
                  {ok, Value1} -> 
  
negative.code:                         _ -> throw({invalid, Name})
                      end
              end;
          Other ->
              throw({invalid, Other})
      end,
      parse_opts(Rest, Opts1).
  
  