This from the ACMA fact sheets.
http://www.acma.gov.au/WEB/STANDARD/pc=PC_1687
Radiocommunications Equipment
The use of non-standard radiocommunications equipment including, but not limited to, cordless phones, land mobile transceivers, CB radios and a range of low power appliances may cause costly interference. Some of the services which may be affected by interference are cellular (mobile) phone services, broadcast radio and television, and two-way radio services, including emergency services.
The use and (sometimes) possession of radiocommunications equipment not specifically designed to comply with Australian standards may be illegal. There are severe penalties for operation, possession for the purpose of operation and supply of radiocommunications equipment that does not comply with applicable Australian standards.
It is illegal to operate any radio transmitter in Australia unless the operation of that transmitter is authorised by a licence issued by ACMA.
Low power transmitters are generally covered by an ACMA radiocommunications class licence. Spectrum usage and equipment standards vary around the world, and it can be difficult to ensure that equipment purchased overseas complies with an ACMA class licence. The operation of most base stations, mobile and handheld transmitters can only be authorised by an apparatus licence, which incurs additional costs.
Two-way base, mobile and handheld equipment other than that used in the amateur service usually requires the assignment of individual operating frequencies. It is most unlikely that this type of equipment, which may be authorised for use in other countries, could be authorised for use in Australia without at least requiring a frequency change, and in many instances cannot be operated at all. As a result, it is generally impractical to bring such equipment into Australia.
As the Australian market for radiocommunications equipment is relatively small compared to the European, US and Asian markets, all of which have different equipment standards and frequency usage regimes, it is not surprising that the vast majority of equipment for sale overseas is unsuitable for use in Australia. The process for having a single piece of radiocommunications equipment tested for compliance to Australian standards is time consuming and expensive. It is generally uneconomic for one-off imports to be tested for compliance.
Radiocommunications equipment approved for use in Australia has the C-Tick label, showing that it meets mandatory technical standards set by ACMA. The C-Tick mark looks like:
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