By Peter H. Gregory, CISA, CISSP
Midsize Business Communications for Dummies is the latest in the highly successful Avaya series and explores the unique challenges faced by midsize businesses and how intelligent communications can improve interactions across employees, suppliers and customers.
Available from Avaya here (registration required):
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Peter H. Gregory 
if anyone has a soft copy of this book please email to me. thanks.
I would encourage you to first contact Avaya (even a sales rep). I checked the site today and it appears that there is a problem, hopefully only a temporary one.