First, read the FAQ titled “Is it possible to send a fax by email without using TTMessenger?
Then: Use the format 6121300123123@ttfax.com.au, or if doing it on TTMessenger, just put in any Australian area code in the area section. Sydney is best because its where we have the most capacity. Yes, all 1300 and 1800 numbers need the area code and the country code. You can choose any area code, but make sure to choose the right country!