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Rating: 
Summary: Good guide, worth the investment
Review: Good blend of information on the technology, vendors and strategies to implementing IP telephony.
Rating:
Summary: A compact, thoughtful and comprehensive manual
Review: How do you write a book on something that doesn't exist yet? That's the dilemma facing John Abrahams and Mauro Lollo, authors of Centrex or PBX: The Impact of IP. They believe IP-Centrex will account for 50%-80% of business lines within the next 10 years. But so far it has been deployed only in a few very limited trials....Nonetheless, Abrahams and Lollo have written a compact, thoughtful, and comprehensive manual on what is known so far about this new service.....
Rating:
Summary: A compact, thoughtful and comprehensive manual
Review: How do you write a book on something that doesn't exist yet? That's the dilemma facing John Abrahams and Mauro Lollo, authors of Centrex or PBX: The Impact of IP. They believe IP-Centrex will account for 50%-80% of business lines within the next 10 years. But so far it has been deployed only in a few very limited trials.... Nonetheless, Abrahams and Lollo have written a compact, thoughtful, and comprehensive manual on what is known so far about this new service.....
Rating: 
Summary: Yawn city
Review: Not a very objective document. More effective material is available on the web or on vendor whitepapers. Much of the material contained seemed out of date even relative to the publishing date. A very data vendor centric view on the topic. Weak. Don't read. Wait for the free download at some point.
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