As for dial-tones and rings, I don't think you will see that changing. The neat thing about many of these implementations...
is that they are invisible to the end user. As for as the end-user is concerned, it is just like using a regular telephone and most of the complexity is handled in the switch. Now, on the other hand, if they use SIP in their implementation, the user could actually dial a phone number by email address or URL. That would add a "re-education" or actually a continuing education factor, as the phones could work either way.
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