If you have read "Seven Deadliest Unified Communications Attacks" and found the book helpful, could you please take a moment to rate and/or review the book on O'Reilly's website? Even if you just enter the number of stars and say something very basic it would be helpful. All you need to do is go to this page:
and click on the "Write Review" link.
In preparation for today's Cyber Monday sale, I looked at the page and noticed that ever since O'Reilly started selling the book as an ebook there have not been any reviews there. There are a few reviews on Goodreads and several very nice reviews over on Amazon.com, but none yet on O'Reilly's site.
These kind of ratings and reviews do help people decide whether to purchase a book - and they are helpful to me as an author, too, to understand what people did (or did not) find useful and helpful.