Free Calls to US

1. Register for IP Phone Service
    http://www.callcentric.com/

2. Link IP Phone Service with actual PSTN number 
    http://ipkall.com/

3. Install good SIP Client on your desktop computer like
    Express Talk from
    http://download.cnet.com/Express-Talk-Business-VoIP-Softphone/3000-2349_4-10400187.html?tag=mncol;1

    Link SIP client to receive calls from SIP Service provider from Step 1

4. Create a Google Voice Account
    Use above number (PSTN Number from Step 2) 
    for registering and activating (account verification) Google Voice

5. Start Enjoying Free calls to US and Canada

6. Use SIP clients Apps for iPhone, iPad and Android phone like "Talkatone" for making calls directly over wifi


Great Site to make calls to US directly from Browser no need to install application
http://www.icall.com

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