The first section looks at the underlying network support for service and aims to explain the technologies that make the user-visible service possible. This section includes multimedia networking, both (heritage), traditional and future (Softswitch) call processing, intelligent networks, Internet, and Wireless networks. Section 3 concludes the book with a look ahead at developing technology and more speculative possibility, discuss the types of services that may in the future and technology that will support them. The focus is on how technology support services rather than the technology itself in order to contributors drawn from both academia and industry (companies such as Marconi, BT, Telcordia, Cisco, analysis) to provide real world perspective sear both theoretical and unique reference source for various materials when This is only found in a different paper, specifications and documentation technology Includes brand new as JAIN, JTAPI, Parlay, IP, multimedia network, active network, WAP, wireless LAN, agent-based services, etc..