Abstract: Multimedia ring back tone (MRBT) service is a value added service which makes multimedia as the ring back tone. An abstract description of the MRBT service using the connection view model (CVM) is addressed with the redefined call party handling mechanism which presents a technology independent service model. The MRBT service described by CVM is mapped to the SIP environment. And a solution of MRBT service in heterogeneous networks is provided according to the model-driven service developing approach.

Key words: Multimedia ring back tone service, Session initiation protocol (SIP), Connection view model

摘要： 多媒体回铃音(Multimedia Ring Back Tone, MRBT)是一种采用多种媒体作为回铃音的增值业务。该文通过连接视图模型对MRBT业务进行了抽象表示，建立了与实现技术无关的MRBT业务模型。在对呼叫方处理机制进行了广义定义的基础上，对连接视图模型进行了扩展，并将抽象表示的MRBT业务映射到了SIP环境中，通过模型驱动的业务开发方法实现了异质环境下的MRBT业务。

关键词: 多媒体回铃音业务, 初始会话协议, 连接视图模型

CLC Number: 

• TP37