Voxee's problem turned out to be a codec issue, which you never would have noticed if you never offered it a choice of codecs to use but told it to use either ulaw/alaw, or G729. As was discovered by a user on the broadband reports VOIP forum, when you allowed both and merely preferred one, Voxee just plain stopped transmitting audio. So the problem with them is correctable (and well and good too, because they offer the useful ability to customize your outbound caller id). I can't speak for Mutualphone, I never subscribed to them.
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