Businesses Increasingly Acknowledge the Cost-Saving Value Proposition of VoIP Access and SIP Trunking Services, Observes Frost & Sullivan

MOUNTAIN VIEW, Calif., July 6 /PRNewswire/ -- The voice over Internet protocol (VoIP) access and session initiation protocol (SIP) trunking services market will continue to build on its impressive, downturn-defying 40.1 percent growth in user base and 22.3 percent growth in revenues in 2009, as ente

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