anchor.diff:  %%--------------------------------------------------------------------
   %% Function: to_norm(Params)
   %%           Params = list() of {Name, Val}
  -%%           Name, Val = string(), are treated as case insensitive
  +%%           Name = string(), treated as case insensitive
  +%%           Val  = string() | none, treated as case insensitive
  +%%                                   unless it starts with a quote
   %% Descrip.: convert a contact-parameter list to a normalized (a case
   %%           insensitive form) form
   %% Returns : contact_param record() |
  
positive.code: %%           component is already present in Params
  %%--------------------------------------------------------------------
  to_norm(Params) when is_list(Params) ->
      F = fun({Name, Val}) ->
  		{ httpd_util:to_lower(Name),
  		  case Val of
  			[$\" | _] -> Val;  %% quoted value, don't lowercase
  			_ -> httpd_util:to_lower(Val)
  		  end
  		}
  	end,
      %% make case insensitive
      L = [F(E) || E <- Params],
  
negative.code: %%--------------------------------------------------------------------
  %% Include files
  %%--------------------------------------------------------------------
  -include("siprecords.hrl").
  
  %%--------------------------------------------------------------------
  