Level3, Global Crossing, Broadvox, Pac-West, IBasis, Neustar and Syniverse. And of course, we all know about Bandwidth.com, who seems to be riding the coattails of Google in place of a sales strategy.
Neustar and Synervse provide back-office support for the Google Voice service.
Business Week's article from a year ago (2009) provides more detail.
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