As far as I know, only Voxeo, Gizmo and Voxalot has already issued iNum numbers to its customers. Voipbuster doesn't have done it yet, despite it's listed has one of the supporters of the iNum initiative. However, in their rates pages they says that dialling an iNum number has no cost. But as emoci said, maybe they haven't yet activated the route for calling iNum numbers, so the call to an iNum can not be connected.
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