scope:

This European Telecommunication Standard (ETS) defines the stage 2 specification of the Supplementary Service Barring of Outgoing Calls (SS-BOC) for the Trans-European Trunked Radio (TETRA) as provided by European operators.

SS-BOC enables barring restrictions for Outgoing calls to be set. SS-BOC specifies the definition, interrogation and operation of the supplementary service. The Switching and Management Infrastructure (SwMI) applies the SS-BOC definitions when the restricted user request an outgoing service.

The SS-BOC actions are defined for the SWMI, for the Mobile Station (MS) and for the Line Station (LS). The SS-BOC information flows may be delivered over the Inter-System Interface (ISI). SS-BOC may also be invoked for services, e.g. calls, within one TETRA system or for services that extend over the ISI to several TETRA systems.

Man-Machine Interface (MMI) and charging principles are outside the scope of this ETS.

Stage 2 describes the functional capabilities of the Supplementary Service introduced in stage 1 description. Stage 2 identifies the functional capabilities for the management and operation of the service in the SwMI, in the MS and in the LS. Stage 2 describes also the information flows exchanged between these entities and the flows sent over the ISI.

NOTE: The stage 2 description is followed by the stage 3 description, which specifies the encoding rules for the information flows and process behavior for the different entities in the SwMI, in the MS and in the LS.