NF ETS 300569

Digital cellular telecommunications system (Phase 2). Closed User Group (CUG) supplementary services. Stage 3. (GSM 04.85).

Le présent document spécifie les procédures utilisées à l'interface radio pour le fonctionnement normal, l'enregistrement, l'effacement, l'activation, la désactivation, l'interrogation et l'invocation par le réseau des compléments de service Groupe fermé d'usagers sur un réseau numérique cellulaire de type GSM.

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- mandatory clauses to satisfy,
- non-essential but useful clauses to know, such as permissions and recommendations.

The identification of these types of clauses is based on the document “ISO / IEC Directives, Part 2 - Principles and rules of structure and drafting of ISO documents ”as well as on a constantly enriched list of verbal forms.

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