Abstract: This paper indicates the problems existing in the present solutions of early-media services, by analyzing the service interoperability between Multimedia Ring Back Tone(MRBT) service and Multimedia Ring Tone(MRT) service, based on IMS(IP Multimedia Subsystem) network. Meanwhile, an early-session based extension means is proposed, which can support multiple early media services simultaneously in the same IMS call instance. The call control models of IMS endpoint are given.

Key words: IP Multimedia Subsystem(IMS), early media, Multimedia Ring Back Tone(MRBT), Multimedia Ring Tone(MRT), call waiting

摘要： 通过对基于IP 多媒体子系统(IMS)网络的多媒体彩铃业务与多媒体彩像业务在业务协作方面的分析，指出现有早期媒体类业务解决方案中存在的问题，提出一种基于early-session的扩展方式，可以在同一个IMS呼叫实例中支持多个早期媒体类业务，并给出IMS终端的呼叫模型。

关键词: IP 多媒体子系统, 早期媒体, 多媒体彩铃, 多媒体彩像, 呼叫等待

CLC Number: 

• TP393