questionswhat is the best free voip system?

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I still like Skype the best.

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I hear google talk works well for both CPU and Mobile talking. i have not used it personally, though.

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Google voice is great, you can forward the number anywhere very easily, and block annoyance calls also.

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I've also heard good things about Google Voice. I don't use it though (yet).

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I'm not sure how good it is, but my friend has Google Voice. The voicemail transcriptions are priceless.