On the island of La Réunion, businesses are making the transition to IP telephony. ZEOP, a local Internet Service Provider, wanted to offer VoIP trunk services to such enterprises—expanding on its estab- lished offerings for residential subscribers. Most businesses are eager to realize the cost savings that come with switching from a traditional PSTN to a VoIP telephony service. Yet many enterprises are not so eager to give up their tradition- al

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