"This book is like a good tour guide.It doesn't just describe the major attractions; you share in the history, spirit, language, and culture of the place."
--Henning Schulzrinne, Professor, Columbia University

Since its birth in 1996, Session Initiation Protocol (SIP) has grown up. As a richer, much more robust technology, SIP today is fully capable of supporting the communication systems that power our twenty-first century work and life.

This second edition handbook has been revamped to cover the newest standards, services, and products. You'll find the latest...

VoIP (voice over IP) networks are currently being deployed by enterprises, governments, and service providers around the globe. Today, the hottest topic with engineers in the field is how to secure these networks. The book teaches practitioners how to design a highly secure VoIP network, explains Internet security basics, such as attack types and methods, and more.

Can a security expert save the Internet from a catastrophic zero day cyber attack by a network of zombie computers, known as a botnet? At what cost? "Credible and believable, this story is told by a subject matter expert. I could not wait to find out what happened next." - Vint Cerf, Internet pioneer "The threat to the Internet from worms, viruses, botnets, and zombie computers is real, and growing. Counting from Zero is a great way to come up to speed on the alarming state of affairs, and Johnston draws you in with his story and believable cast of characters." - Phil Zimmermann, creator of...