Vonage Holdings Corp.’s (VG) international calling plan proved key to the VoIP provider’s first-quarter earnings.For the second consecutive quarter, Vonage reported a profit, thanks in large part to Vonage World. The New Jersey-based company showed net income of $14 million, up from $5.3 million a year earlier. The year-ago profit, however, happened as a result of a benefit form an ... (182 words)

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