haven't found any book (ciscopress) for Cisco Unity 7. Does anyone know whether a book is available? Or can anyone recommand another good book? How about the Cisco Unity Fundamentals book?
To my knowledge, there is not a new book specifically for Unity 7, but the underlying architecture has not really changed much since Unity 4 versions. While I have not personally read it, The Unity Fundaments book is reportedly quite good. I feel that if you are looking for a good foundation, read it and follow it up with a couple on line CCO documents:
The Unity 5.0 design guide (only a few features change in Unity 7.x)
Unity 7.x release notes: