Tried and tested. Very good voice quality. Best free call to Canada so far, better than VoIPCheap, InterVoip, 12Voip, etc. No software installation. Currently running only with Internet Explorer.

Click below wiki list to view all North American countries you can call for FREE.

http://en.wikipedia.org/wiki/List_of_North_American_countries

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http://labs.jaduka.com/earthcaller/

EARTH CALLER

FREE PC to Phone calls to any North American phone number from anyplace on the planet.

All you need is a computer equipped with a microphone (or a headset with mic) and a connection to the Internet using Internet Explorer.

No software to download or install.

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http://callingamerica.com/

CALLING AMERICA

Calling America is revolutionary new technology offering free, add sponsored VOIP calls.

No software to download or install.