I have flown with many FO's over the past 18 months who have told me the 'leaving' call is no longer required. I was visiting the ATC center in Melbourne recently and asked the Supervisor there and he said 'the old system would not notify us of an aircraft commencing descent which is why we required a 'leaving' call as per the AIP, the new system does notify us so we don't require a 'leaving' call as we will be notified electronically'. He then said that 'technically it is still in the AIP as there is a huge process to get it removed (underway) so it still should be reported but that most controllers don't care'. So the mentioned controller is technically right but to be honest is being a bit of a prick the way he is going about making his point.