Specifically to your question though, people are attached to their phones. There will certainly be an evolution where more users will rely on software-based soft phone clients, or mobile phones, and other devices that can be connected with a unified communications infrastructure. But, companies and users will be reluctant to simply give up those phones. Instead, enterprises will rely on remote call control (RCC), and dual-forking to accomplish simultaneous ringing between the desk phone and the software client, and to integrate the desk phone into the unified communications experience as tightly as possible. If anything, I think you will see analog phones die a quick and sudden death as enterprises adopt IP phones that have more functionality and extensibility related to unified communications.
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