Sorry morno, re read the orginal post.
The two ATC systems (ADATS and TAAATS) don't talk very well to each other. Using your example, when you taxi at Brisbane your POB is entered into an electronic flight data record. The Air Services (TAAATS) electronic FDR cannot be seen by Townsville Approach, so they'lll ask you for your POB once your transfered to them. Thats then passed to TWR. Thats the same for all MIL TCU's (Pearce may be an exception as they use TAATS). When both ATS providers are all using the same system down the track one day this will probably become a thing of the past.