This topic provides information about clocking or unblocking circuit groups in the following scenarios:
The application requests blocking of a circuit group by invoking ISUPStatusReq with the event type of CIRGRPBLKREQ. The application is notified of the completion of the group blocking procedure (the receipt of a group blocking acknowledgment message) by receipt of a status indication (EVTSITSTAIND) with the event type of CIRGRPBLKRSP.
The following illustration shows a group blocking request initiated by the application:
If the far exchange initiates the blocking of the circuit group, the application receives a status indication (EVTSITSTAIND) with the event type of CIRGRPBLKREQ from the ISUP layer. The application acknowledges the circuit group blocking by invoking ISUPStatusReq with the event type of CIRGRPBLKRSP.
The following illustration shows a group blocking request initiated by the far exchange:
The application requests unblocking of a circuit group by invoking ISUPStatusReq with the event type of CIRGRPUNBLKREQ. The application is notified of the completion of the group unblocking procedure (the receipt of a group unblocking acknowledgment message) by receipt of a status indication (EVTSITSTAIND) with the event type of CIRGRPUNBLKRSP.
The following illustration shows a group unblocking request initiated by the application:
If the far exchange initiates the unblocking of the circuit group, the application receives a status indication (EVTSITSTAIND) with the event type of CIRGRPUNBLKREQ from the ISUP layer. The application then acknowledges the circuit group unblocking by invoking ISUPStatusReq with the event type of CIRGRPUNBLKRSP.
The following illustration shows a group unblocking request initiated by the far exchange: