DIN EN 301711:2003-08
Digital cellular telecommunications system (Phase 2+) (GSM) - User-to-User Signalling (UUS) - Stage 3 (GSM 04.87 version 7.0.2 Release 1998) (Endorsement of the English version EN 301711 V 7.0.2 (1999-12) as German standard) / Note: DIN ETS standards c...