Cheap Conference Calling

Cheapest way to call India from Bombay?

I have to call someone in Bombay, India. We need to talk for an hour. I wonder how the cheapest way to make that call. Is there toll-free numbers that work / conference call numbers that work well to be profitable? Are there phone cards work best? Does Google really speak of a team? Is it clear the quality of the conversation? Thank you for your help. I'm in the U.S.

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