ETSI TS 182 012-2006 电信和互联网融合业务及高级网络协议(TISPAN).基于IMS的PSTN/ISDN仿真子系统.功能架构(版本1.1.1)
Telecommunications and Internet Converged Services and Protocols for Advanced Networking (TISPAN); IMS-based PSTN/ISDN Emulation Subsystem; Functional architecture V1.1.1