The Sydney Morning Herald has an article on AuseMed installing Asterisk:
MEDICAL call centre AuseMed adopted an open source internet solution when it wanted more flexibility in its phone system. The Melbourne centre has about 20 nurses receiving calls from chronically ill people with diseases such as asthma, diabetes, arthritis, and heart ailments who might have a query about their medication or want to know whether they need to call an ambulance.
"Our nurses receive the calls 24/7 and we want them to have the flexibility to do that at home," says AuseMed director Randal Varney.
A couple of months ago AuseMed installed a Linux-based Asterisk open source private branch exchange (PBX) and telephony tool kit. "With Asterisk we can just route calls through to anywhere," says Mr Varney.