I appreciate that Ivasrus is letting us know what is required in Sydney but for pilots it's a problem remembering the individual local procedures at all the ports that they fly into - eg Singapore require POB & Transponder code on first contact at the FIR boundary plus readback of everything in a clearance whereas other ports just require readback of just the essential elements of a clearance.
It would be simpler and safer to have standard procedures in use worldwide.