The holy grail of communications is being able to truly integrate the fixed and mobile phone worlds and in an ideal scenario users would have access to corporate resources such as directories from any mobile device they choose. As technology evolves corporate user's brains must evolve as well using a variety of devices and interfaces. Telecom is really a mess when you think about it. Press 3 to delete voicemail in the office, press 7 to delete it on the cell phone, etc.

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