anchor.diff:      %% an RFC3261 compliant device, see RFC3261 17.2.3
       case sipheader:get_server_transaction_ack_id_2543(Request) of
   	error ->
  -	    logger:log(error, "Transaction state list: Could not get server transaction RFC2543 ACK id for request"),
  +	    logger:log(error, "Transaction state list: Could not get server transaction RFC2543 ack-id for request"),
   	    error;
   	Id ->
   	    ToTag = sipheader:get_tag(keylist:fetch("To", Request#request.header)),
  
positive.code: 		    logger:log(debug, "Transaction state list: Found no matching server "
  			       "transaction for ACK using RFC3261 methods, trying RFC2543 too"),
  		    get_server_transaction_ack_2543(Request);
  		T ->
  		    T
  	    end
      end.
  
  
negative.code: 		none ->
  		    logger:log(debug, "Transaction state list: ACK request does not match any existing transaction"),
  		    %% If this ever happens, this extra debug output will probably be crucial to
  		    %% diagnose why. However, it can't be enabled per default in case there are
  		    %% a _lot_ of transactions on your server.
  		    %%logger:log(debug, "Transaction state list: Extra debug: Looked for server transaction with ack-id ~p "
  		    %%	       "AND to-tag ~p in list :~n~p", [Id, ToTag, debugfriendly()]),
  		    none;
  		Res when is_record(Res, transactionstate) ->
  		    Res
  