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:                 error -> 
                      [{local_host6, nksip_lib:to_binary(Host)}|Opts]
              end;
          no_100 ->
              [{no_100, true}|Opts];
  
          {plugins, List} when is_list(List) ->
  
negative.code:                         _ -> throw({invalid, Name})
                      end
              end;
          Other ->
              throw({invalid, Other})
      end,
      parse_opts(Rest, Opts1).
  
  