John Rittinghouse PhD CISM & James F. Ransome PhD CISM CISSP 
Voice over Internet Protocol (VoIP) Security [PDF ebook] 

Voice Over Internet Protocol Security has been designed to help the reader fully understand, prepare for and mediate current security and Qo S risks in today’s complex and ever changing converged network environment and it will help you secure your Vo IP network whether you are at the planning, implementation, or post-implementation phase of your Vo IP infrastructure.* This book will teach you how to plan for and implement Vo IP security solutions in converged network infrastructures. Whether you have picked up this book out of curiosity or professional interest . . . it is not too late to read this book and gain a deep understanding of what needs to be done in a Vo IP implementation.* In the rush to be first to market or to implement the latest and greatest technology, many current implementations of Vo IP infrastructures, both large and small, have been implemented with minimal thought to Qo S and almost no thought to security and interoperability.