ETSI TS 182 012-2008 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(PES).功能架构(版本2.1.4)
Telecommunications and Internet converged Services and Protocols for Advanced Networking (TISPAN); IMS-based PSTN/ISDN Emulation Sub-system (PES); Functional architecture (V2.1.4)