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标准下载>ETSI TS 129 165/7-2016 Digital Cellular Telecommunications System (Phase 2+) (Gsm); Universal Mobile Telecommunications System (Umts); Lte; Inter-Ims Network To Network Interface (Nni) (V13.5.0; 3Gpp Ts 29.165 Version 13.5.0 Release 13)免费下载