There are many Australian VoIP providers with most offering the option of buying VoIP hardware from them or bringing your own (BYO) that you’ve purchased elsewhere.
VOIP: A Fixed Line Alternative. VoIP or Voice over Internet Protocol is the technology and products that allow telephone calls over IP networks, your internet connection. This can be a good way to slash telephone bills and get rid of your traditional fixed line. VoIP calls can also be made on mobile phones via 3G and 4G networks or via WiFi connections. Many people are now using VoIP as a fixed line alternative.