All you need to know about the deployment of VoIP protocols in a comprehensive and highly practical reference one - Now updated with coverage on SIP and IMS infrastructure This book provides a comprehensive overview and practical technology behind the Internet Telephony (IP), provides important information for Network Engineers, Designers, and Managers who need to understand the protocol. Drawing on extensive research and practical experience in the development of VoIP from the early stages, the authors provide references accessible to all relevant standards and cutting-edge techniques in a single resource. Key Features: Updated with a chapter on SIP and IMS infrastructure includes ALL of the major VoIP protocols? own experiences chapter on the reasons for the IP telephony and descriptions of technical and business drivers for the transition to all IP networks This book will be a valuable guide for professional network engineers, designers and managers, decision makers and project managers oversee the implementation of VoIP, market analysts, and consultants.