The book describes the IP-Centrex option of having the telephone company take responsibility for the service delivery and offers the kind of information service providers need to improve marketing and sales campaigns for IP-Centrex services ...
Promotion is nice, in fact welcomed, but to strive once promoted is a larger task. Deemed relevant for study, and more for pleasure, these works are calibrations of a designed future.
... Centrex service, however, this choice is lost, since Centrex is dependent on what the local central office offers; digital Centrex may or may not be available, and the user loses control of the decision, which now rests with the local ...