According to Infonetics Research, Nortel is the leader in the North American IP-PBX market. Avaya is placed second with Cisco hot on its heels. The IP PBX market registered revenues of $ 2.1 billion in the third quarter; this is a 17% growth over the previous year and a 7% growth over the second quarter. The growth is driven by companies migrating to VoIP. At present, the major chunk of the revenue comes from hybrid PBXs; pure IP contributed only 1% of the total revenue.
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