You'll find the latest on SIP usage beyond VoIP, including presence, instant messaging (IM), mobility, and emergency services, and peer-to-peer SIP applications, quality-of-service, and security issues - everything you need to build and use SIP services today. This book will help you * Work with SIP in Presence and event-based communication * Handle SIP-based application-level mobility issues * Develop applications to facilitate communications access for users with disabilities * Set up an Internet-based emergency services * Learn how to peer-to-peer SIP systems may change VoIP * Understand the importance of Internet transparency * Identify relevant standards and specifications * Handle-potential-quality service and security issues