"It is important to distinguish between a profitable business that successfully sells VoIP services and a profitable VoIP business. Successful VoIP businesses are driven by other services the company offers, and by services that align with customers' perceived needs not by the VoIP business alone."
In the early 2000s, telecom industry experts widely expected VoIP to change the dynamics of the voice communications business. But a decade later, the largest providers of consumer Internet voice services are, with one exception, conventional telecommunications companies. Some are pioneers and innovators, some are not. What they do share, however, is a market strategy that doesn't rely solely on price.
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The Future of Consumer VoIP: Leveraging Internet advances for profitable consumer voice services