VoIP Historical Milestones

Here is a collection of VoIP historical milestones using an info-graph... 

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VoIP: the world of a growing technology

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Global VoIP Revolution

External related link/s and resource/s:

A Brief History of VoIP

History of VoIP and Internet Telephones

Infographic: History of Analog Phones to VoIP - VoIP Insider

› VoIP Historical Milestones

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