AussieScanners.com.au

The SA Ambulance Service will be transitioning to their digital and encrypted talkgroups on the evening of Tuesday the 11th of November.
All digital and encrypted talkgroups will not be able to be monitored on a scanner.

SA Ambulance will apparently also be reducing the amount of information sent via the pager network.
[From SA-Scan yahoo group]

P25 Phase 2? perhaps same as the GWN in QLD?

There is a very detailed and helpful section that can be found on the SaScan monitoring site

http://www.sascan.net.au/?page=infPages/infAmbulance