This specification describes the network feature Operator Determined Barring (ODB). This allows the network operator or service provider to regulate, by means of an exceptional procedure, access by the subscribers to GSM services, by the barring of certain categories of outgoing or incoming calls or of roaming.
DS/ETS 300513:1995 history
1995DS/ETS 300513:1995 European digital cellular telecommunications system (Phase 2);Operator determined barring - (GSM 02.41)