Phase 4? Like PSTN I can use any device to call any device. When it will be possible to communicate (call, visio, chat...) between different software vendor? Instead to say "you must use MY solution" the world will be open to all... this is the original idea no?

Another very interesting point is missing: Chabot of course! We are in the digital revolution and nothing about that in your paper.

But Thanks for this beautifully communication tools that i use everyday!