Metric:Most corporate telephony to be VoIP

According to a study by the Radicati Group, three-fourths of corporate telephony systems will be VoIP systems by 2009. A majority of medium to large-sized companies are in the process of upgrading their PBX's to hybrid IP PBX's. The study predicts revenue for hybrid and pure IP PBXs will grow from $1.5 billion in 2005 to $9.9 billion in 2009. A separate study conducted by Heavy Reading, found that 50 percent of telecom firms' staffs said their telephony system will be VoIP by 2007. The report surveyed 175 carrier professionals representing more than 130 network operators worldwide.

For more on these VoIP studies:
- read this article from vnunet

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