New data from TeleGeography partner Synergy Research Group show that enterprise voice equipment revenues reached USD2.4 billion in Q4 2011, bringing total revenues to USD9.6 billion for the year. The market has plateaued over the last three years, with quarterly revenues staying within a fairly narrow range of USD2.3 billion to USD2.5 billion
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OVETEL Cisco and Avaya tighten their grip on the enterprise voice market
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