Design And Implementation Of Delivery Function Of Call Signature Service Based On VoLTE

With rapid growth of the LTE system,the age of LTE is coming.When looking at the options for ways of carrying voice over the LTE system,VoLTE will be the target solution by virtue of technological superiority.Besides,VoLTE can integrate with RCS and provides more services for customers.In order to meet customers' demands,the present telecommunications business need to provide services based on VoLTE.As a value-added service launched by China Mobile,call signature service has mature product concept.It is planned to be a unique screen service over RCS based on VoLTE,so it has a huge space for development and good prospects.In order to meet customers' demands in VoLTE stage,the paper aims at delivery function of call signature service and makes a detail introduction of the implementation of call signature service system.The system is divided into call control subsystem,service function subsystem and delivery policy subsystem.Call control subsystem is responsible for processing SIP message and retrieving the necessary data of service;service function subsystem is responsible for executing service logic,it ensures that call signature service can provide a variety of service functions;delivery policy subsystem is responsible for querying user's domain and delivering call signature messages by using USSD or flash SMS.Based on design and implementation of the system,this paper is structured as follows.The first chapter introduces the background including call signature service and some related technologies.Chapter II analyzes the requirements of the entire system in detail.Chapter III describes the network structure and the module structure of the call signature service platform.Chapter IV details how to design and implement every module.Chapter V describes the test work and test results of the entire system.