Next is the LNB and transponder settings. Obviously this is a bit different in OZ but a quick google it seems similar to NZ. Below is the text from the DVBViewer transponder .ini file I have edited and now use for SKY and Freeview in NZ from Optus D1
2=1 Optus D1 NZ
the [SATTYPE] portion sets out the LNB settings, particularly 4,5 and 6 being the important numbers. It seems in Oz most common LOF freq is 10700 (instead of 10750 here) but you might also try 11300. The [DVB] part sets out the transponder freqs to scan. Below is an example you may want to try.
2=1 Optus C1 test
Copy it and paste it to a new "notepad" document then save it as 1561.ini in your /DVBViewer/transponders/ folder. Then try scanning it in DVBViewer to see how you go. I have just taken the freqs from the current DVBViewer Optus C1 .ini so if it works partially you may want to go to http://www.lyngsat.com/optusc1.html and update it. If it doesn't work first time change both instances of 10700 to 11300 and try again.
I'm no expert with this stuff but hopefully that may help a bit.