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I am not a specialist of deep networking services, but there was is so much hype on VoIP that I wanted to have a look. ITXC is a wholesale network service provider. They have a proprietary network based on IP and the offer connection services to other VoIP-providers and to PSTN-providers. Thanks to their numerous interconnection deals, they can terminate any (?) international call. ITXC will merge with TeleGlobe, another global provider, so I guess the technology is getting accepted.
From a service point of view I do not understand why they are called VoIP-providers. They offer wholesale PSTN-interconnection services (if this a good term). From the PSTN-customer point-of-view, it is the same as other interconnection services. They do not (should not) care about the technology used. Only for other VoIP-providers it does matter (I think), as they need another interface in order to exchange the call control.
[inspiration Fred (a VC)]