The present document identifies the 3GPP Technical Specifications and Technical Reports specifically relating to the Common IP Multimedia Subsystem (IMS) maintained by 3GPP. Standards organizations adopting the Common IP Multimedia Subsystem (IMS) might not need to use all listed specifications
TS 121 202-2017由ETSI - European Telecommunications Standards Institute 发布于 2017-01-01,并于 2017-04-04 实施。
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