"Enhanced air traffic services at regional airports
After consultation with other aviation agencies and industry, Airservices defined the implementation plan for improving air traffic service arrangements at a number of major regional airports.
Priority was given to regional airports that show a predicted growth in traffic levels, which have existing surveillance infrastructure that is of suitable quality to provide the approach services. During the review, the surveillance methods considered included the use of new and existing technologies that were developed over recent years, these include Automatic Dependant Surveillance Broadcast (ADS-B) and Wide Area Multilateration (WAM).
The plan outlines a phased approach to the introduction of Regional Approach Services (RAPPS) using surveillance, initially focusing on seven locations, namely Hobart, Launceston, Rockhampton, Mackay, the Sunshine Coast and Alice Springs. Other airports listed in the mandate will be reviewed periodically to determine if the traffic density warrants the need for SAFRA-type services."
found this is the airservices website. not exactly about towers but gives an small indication of their process.