And make sure you pay attention to the NOTAM requirements if you're operating in the underlying Class G airspace - some NOTAMs require you contact BN/ML CTR if you're operating planning on operatingIFR in G. Others require you to contact CTR if you're planning to operate in G irrespective of flight category.
Quote:
PILOTS/OPERATORS CONSIDERING OPR IN CLASS G SHALL CTC MELBOURNE CENTRE TEL: (PLUS) 61 3 9235 7455 FOR FURTHER INFO.
Quote:
PILOTS/OPERATORS CONSIDERING OPR IFR IN CLASS G SHALL CTC MELBOURNE CENTRE TEL: (PLUS) 61 3 92357455 FOR FURTHER INFO.
Note the subtle difference...
That could just as easily be a stuff up in the NOTAM, as a genuine intended difference!