According to Gartner Research, annual shipments of business IP phones in the US and Canada will top 4 million in 2005 and exceed 11 million in 2009. The study claimed that the enterprise VoIP industry's revenue will grow throughout the forecast period, reaching $1.3 billion in 2009. Continued adoption of VoIP among big businesses and new VoIP trends, like wireless VoIP, are expected to fuel much of the growth.
For further reading on IP phones:
- see this story from ZDNet