Foreword
According to a Gartner market share analysis done for Enterprise Unified Communications on June 23, 2009, the total vendor revenue from the entire enterprise unified communications segment in 2008 was $5.1 billion. FierceVoIP quoted ISP-Planet study in its online newsletter on July 28, 2008, saying that the total subscribers in just the United States for the top 10 VoIP service providers are around 18 million and growing in double digits. Comcast came in on top at 5.2 subscribers followed by Time Warner (3.2 million) and Vonage (2.6 million), based on their first-quarter reporting in 2008. This puts great emphasis on managing VoIP for both enterprises and service providers.
Management of a VoIP network is a cyclic process that starts ...
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