Voice and data convergence is speeding up, according to newly published research from Dell'Oro Group.
The analyst firm reported that sales of PBX IP lines increased 42 per cent year-over-year during the fourth quarter of 2005, while sales of traditional circuit-switched TDM lines decreased by two per cent.
"The momentum is building for IP line sales. For example, the rate of growth in the fourth quarter 2005 was about 50 per cent higher than the past several quarters," said Steve Raab, director of IP telephony research at Dell'Oro Group.
"This new level of growth is sustainable because manufacturers have enhanced the feature richness of their IP products, and users are more familiar and comfortable with voice over IP."
The report also predicted that Nortel is on track to generate more PBX sales from IP lines than TDM lines in the next two quarters.
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