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I have been using this for a while, except through sipdiscount.com (it is the same company, it is basicly the same thing). And the call quality is actually pretty good, though there is some lag, for me it is under half a second. But it isn't a replacement for a phone, but it certianly can be useful if you have a good WiFi connection.
And for free there is no way you can go wrong
Nice simple and quick guide :)
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