B.2 Call barring

03.793GPPStage 2Support of Optimal Routeing phase 1TS

SMG1 has accepted the principle that all supplementary service and operator determined call barring programmes except for BAIC are applied for cost control reasons. Hence if an optimally routed call reduces the cost to a subscriber to whom a barring programme applies below the threshold for the barring programme the barring should not prevent the optimally routed call being completed. This principle applies both to basic optimally routed calls and to forwarded calls.

B.2.1 Outgoing call barring

The application of this principle to a mobile-originated call requires the application of outgoing barring to be deferred until the ultimate destination has been determined. SMG1 have decided that for phase 1 the existing application of outgoing barring according to the B party MSISDN shall apply. The application of barring according to the actual destination of the call will be considered for a later phase.

B.2.2 Incoming call barring

The application of this principle to a mobile-terminated call requires the HLR to check whether a request for routeing information is for optimal routeing; if the request is for optimal routeing, SS BIC-Roam, ODBIC-Roam and ODBIC-RoamHZ shall not bar the call. SMG1 have decided that for phase 1 the existing application of SS BIC-Roam, ODBIC-Roam and ODBIC-RoamHZ shall apply even if optimal routeing leads to no chargeable roaming leg. The bypassing of SS BIC-Roam, ODBIC-Roam and ODBIC-RoamHZ by OR will be considered for a later phase.

B.2.3 Call barring/call forwarding interactions

The application of this principle to call forwarding requires the interactions between call forwarding and outgoing call barring and between call forwarding and incoming call barring other than BAIC to be checked at the time of invocation of call forwarding rather than at the time of registration or activation of call forwarding or the time of activation of call barring. In an environment where some entities support OR and others do not, the handling of interactions is complex, and the behaviour perceived by the subscriber is inconsistent. It has therefore been decided that for phase 1 of OR the interactions between call forwarding and outgoing call barring shall be checked at the time of registration or activation of call forwarding or the time of activation of outgoing call barring, as specified for GSM phase 2. The check of barring at the time of invocation of call forwarding rather than at the time of registration or activation of call forwarding or the time of activation of call barring will be considered for a later phase.