Design And Implementation Of Multimedia Ringning Serivce Based On IP Multimedia Subsystem

With the release of R6 version, IMS is becoming more and more mature. Providing a more diversified and personalized service is becoming a new problem for the carrier. Multimedia Ringing Service(MRS) that this paper discussed is such a kind of value-added service based on IMS.MRS is a service which based on the caller party and display on the called terminal. The MRS user can visit the MRS web setting ringing rules and specifying a ringing audio, video, images, text or vcard for the rule. When the MRS caller user call the called user and the rule which MRS user set is satisfied, the MRS service will transfer the ringing media to the called party. Before the called user answer the phone call, the called terminal will display or play the ringing media until the called user pick up the phone.The MRS service is the core part of MRS platform. It processes the sip signaling control, multimedia ring coding, database layer abstraction and multimedia ringing selection. MRS service is implemented using 3GPP R5 standard IMS core network technology as the underlying core network. Based on IMS technology, the MRS service can easily communicate with soft-switching and CDMA network terminal. The MRS platform has passed Guangdong Telecom Research Institute test.This paper is structured as follows. The first chapter introduces the background of MRS and IMS, this chapter also points out the significance of the research. ChapterⅡdetails the system requirements analysis, includes IMS core network function requirements, MRS service function requirements, MRS terminal function requirements and service management requirements. ChapterⅢdescribs the logic structure of the MRS platform. ChapterⅣis the main part of this paper. The author details how to design and implement the sevice. This chapter divides the sevice into the call logic control module and ringing media module. And then introduces the sip signaling processes, ringing media coding, database design and the algorithm of selecting the ringing. ChapterⅤdescribes the method of the service’s functional test and China Telecom test, then give a brief summary of test results.