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在介绍语音质量监测系统的整体结构及功能的基础上。进一步提出核心网Nb接口的监测方案。根据协议信令流程，创新性地采用了Hash算法高效合成CDR并完成媒体流的协议分析。最后。通过RrrP流和Iu—CS／A接口信息的关联，完成端到端的语音质量分析，从而了解到语音质量的分布特征以及可能潜在的网络故障隐患。本方案通过现网测试，效果良好。“,”Based on the introduction of the 3G Core Network Voice Quality Monitoring System, this pa- per introduces the monitoring programme of the Nb interface in Core Network. According to signaling process, the system uses efficient hash algorithm to analyze CDR and completes the protocol analysis of media stream information. Finally, by using the rel- evance of RTP streams and the information in Iu- CS/A interface, the system can accomplish end-to- end voice quality analysis, and get the distribution of the voice quality as well as the potential network failure risks. The solution has been implemented and got good resuhs in the real network.