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ETSI TS 123 087
M00000824
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ETSI TS 123 087 Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); User-to-User Signalling (UUS) supplementary service; Stage 2 (3GPP TS 23.087 version 16.0.0 Release 16)
standard by European Telecommunications Standards Institute, 07/01/2020
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