tailieunhanh - Dịch vụ mạng thế hệ kế tiếp P13

Bringing it all Together – the New Network Architecture In Part 2 of the book we have explored some of the key existing services and how they may progress. In this chapter I would like to take you a little way into the future, for a view of what the network may look like and explore how a service or group of services may fit together to form a useful example of where next-generation networks will take us. Let us go over the components of the next-generation network: | Next Generation Network Services Neill Wilkinson Copyright 2002 John Wiley Sons Ltd ISBNs 0-471-48667-1 Hardback 0-470-84603-8 Electronic 13 Bringing it all Together -the New Network Architecture INTRODUCTION In Part 2 of the book we have explored some of the key existing services and how they may progress. In this chapter I would like to take you a little way into the future for a view of what the network may look like and explore how a service or group of services may fit together to form a useful example of where next-generation networks will take us. Let us go over the components of the next-generation network Media gateway and signalling gateways these are the interfaces back to the Time Division Multiplex TDM world of the current Public Switched Telephone Network PSTN and Public Land Mobile Network PLMN . Media gateway controllers call servers softswitches and application servers. These are where the new services execute. Media servers or Internet Protocol Interactive Voice Response IP-IVR these are the components that provide the voice of the network and automate a number of voice enabled applications. Directories these will store all the configuration information about services users and equipment inventory for example Application-specific configurations for each client customer. Personalisation information on a per user basis buddy lists preferences usage statistics favourites and bookmarks . Device information and capabilities. 168 BRINGING IT ALL TOGETHER - THE NEW NETWORK ARCHITECTURE Location of application components and whole service instances. Service translations freephone style service translation info . Security tokens access control lists and encryption keys . User location information. Virtual Home Environments VHEs . Service tags flags to indicate what the user is allowed to do. For example if someone hasn t paid their subscription fee then a flag could be present to prevent them from using any billable services. User scripts for example