If you are in nepal . i can give u some contact where you can go and that guy can help you to setup one in your house.
 for this thing to work you will need the following
1. cable internet
2. router (dlink which is cheaper)
3.Device New linksys VOIP PAP2 Phone vonage Adapter NA unlocked) search on ebay
4. telephone set
5.you have to open  Dollar account(min $10) with wlink or Hons in nepal.they will give you username and password for sastocall.com you can put more money anytime you want.
 
it is basically internet phone.it is not only cheaper to USA but works with most of the country.

This is the same thing that all the cyber and communication are using it.

 
if u are intrested let me know. I will be glad to share more information