Enterprises and consumers still spend lots of money on voice services delivered over some sort of wired connection, including "plain old telephone service" as well as newer replacement services such as cable-provided "digital voice" (voice over IP) or hosted business phone services.
But wireless is where the action is moving. And while lots of different approaches to integrating wireless and wireline access are being tested and deployed, it's hard to escape the conclusion that wireless increasingly is the dominant way people "do voice," even when some amount of talking shifts to PC-to-PC format.
There will be lots more integration of features and call delivery between wireless and wired modes, to be sure. But there will be an equally large amount of wireless substitution as well, even in the enterprise customer segments.
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