anchor.diff:         is_list(ViaParameters), is_atom(Proto), is_record(Request, request) ->
       ReqHeader = Request#request.header,
       AnswerHeader1 = keylist:appendlist(keylist:copy(ReqHeader, [via, from, to, 'call-id', cseq,
  -								'record-route', "Timestamp", 'content-type']),
  +								'record-route', timestamp, 'content-type']),
   				       ExtraHeaders),
       %% PlaceHolderVia is an EXTRA Via with our hostname. We could do without this if
       %% we sent it with send_response() instead of send_proxy_response() but it is easier
  
positive.code:     %% The preservation of Timestamp headers into 100 Trying response is mandated by RFC 3261 8.2.6.1
      AnswerHeader5 = case Status of
  			100 -> AnswerHeader4;
  			_ -> keylist:delete("Timestamp", AnswerHeader4)
  		    end,
      set_response_body(#response{status=Status, reason=Reason, header=AnswerHeader5}, Body).
  
  
negative.code: 
      %% Timestamp NOT present in 486 Busy Here
      autotest:mark(?LINE, "make_response/7 - 2.3"),
      [] = keylist:fetch(timestamp, Response2#response.header),
  
      %% Content-Type NOT present in 486 Busy Here with empty body
      autotest:mark(?LINE, "make_response/7 - 2.4"),
  