The cancellation of the odd SARTIME wouldn't normally be a problem, and I think most controllers would be happy to relay this for you to CENSAR.
However, I do recall not long after the removal of the dedicated FW freq near Adelaide (I think it was 133.95 but I'm guessing), there was a constant stream of SARTIME cancellations being made to the surrounding enroute sectors by a/c landing at Parafield.
That in itself should not really be a problem, but it was, because the comms were so bad, and some of the accents so thick, that it was not unsual to make 3 or 4 calls before you were confindent you'd copied their details correctly, or, they were simply just unreadable.
In the middle of a busy gaggle, this would tie up the freq and did at times cause real problems for the sector controllers.
James Michael, sometimes statistics don't tell the whole story,
Cheers.