What you need:
You just need to have an internet connection, preferably broadband speed.
What to do:
Call MyNetFone at 1300 731 048. MyNetFone has one of the best VOIP plans. I go for the SuperSaver, which is $0 per month. You just prepay and then top up with Bpay when your credit is low.
Yesterday (21st April 09), MyNetFone launched a promotion which ends on 3rd May'09. Go for the Linksys SPA2100 phone adaptor. It costs $19.95, inclusive of $10 credit. But you have to sign up for a plan. Go for the MegaSaver. It'll cost you $9.95 per month and the contract is 12 months, but you get a 100 free calls every month. At the end of the year, you can opt to get out of it. If you miss the promotion, then just pay the normal price of $69.95 and go for SuperSaver ($0) plan.
What are you waiting for?
Just call the number given above, and order what you need, and MyNetFone will send you the adaptor. Plug it into your internet, and connect your normal phone (cordless is OK. Just connect the base station to it) and you will be able to make your calls rightaway. If you want to read more about it, go to: https://www.mynetfone.com.au/
What you'll save:
After installing VOIP, I changed my landline phone to the cheapest ($20/month) plan. I use landline to receive calls only, and make all outgoing calls with VOIP. You'll easily cut your phone bills into a fraction of what it is now. The big telcos do not like you to use VOIP, so they'll try to tie you down with bundled plans. Don't fall for it.