You can even have it integrated with your home telephone line (i.e. DECT) and everything will be completely transparent.
I use this one:
Unfortunately they don't manufacture this Philips voip841 any longer (still possible to buy a brand new but they are like twice its original price: ~USD400 at amazon). This is a really good phone. Mine is 7 or 8 yo at this point and still works without any major issues.
There are some other, similar dect phones, but people complain about them.
I was looking for a backup for the Philips phone (7yo is a lot for electronics, esp. in Singapore) and recently I bought this:
http://freetalk.me/featured-skype-acces ... skype.html
I don't have it extensively tested but It seems to work fine and is dirty cheap.