ETSI TS 124 080
- Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); Mobile radio Layer 3 supplementary service specification; Formats and coding (3GPP TS 24.080 version 3.6.0 Release 1999)
- standard by European Telecommunications Standards Institute, 12/01/2001
- Publisher: ETSI
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