随着MSRP协议在3G IP多媒体子系统中的广泛应用,其消息的媒体中继问题也成为了研究热点.目前MSRP协议媒体中继方法对终端的要求比较高,不仅增加了终端实现的复杂性,同时也带来了安全方面的问题.本文分析了MSRP协议媒体中继的相关技术,提出通过SIP服务器进行AUTH方法的MSRP媒体中继改进方案,并通过在SIP服务器中引入MSRP协议媒体中继模块,以及改进MSRP中继服务器的方式给出了该方案的具体实现方法.最后,使用抓包工具分析实验验证了该方法的正确性. With the widespread application of MSRP protocol in 3G IP multimedia subsystem, the problem of media relay has also become a research hotspot.At present, the MSRP protocol media relay method has higher requirements on the terminal, which not only increases the complexity of the terminal implementation , But also bring about security problems.This paper analyzes the related technologies of MSRP media relay, proposes a scheme of MSRP media relay through AUTH method through SIP server, and introduces MSRP protocol media relay in SIP server Module and how to improve the MSRP relay server are given.Finally, the experiment of packet capture tools is used to verify the correctness of the method.