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 hp OpenCall SS7 platform Application Developer's Guide: For Release 3.1 on Linux > Chapter 20 ISUP Circuit Maintenance - Procedures Specific to ITU-T

Circuit Group Blocking/Unblocking
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ITU-T based HP OpenCall SS7 ISUP handles both types of Group Blocking messages:

  • Group Blocking for maintenance reasons

  • Group Blocking for hardware reasons

Group Blocking (Maintenance Oriented)
- From Network - Normal Case

In this scenario, a CGB message is received from the network. The message specifies that maintenance group blocking should be performed. Consequently, HP OpenCall SS7 ISUP:

  • issues a GROUP_BLOCKING_IND primitive

  • issues a MAINTENANCE_SYSTEM_IND primitive indicating MN_GROUP_BLOCKING

  • upon receipt of a GROUP_BLOCKING_RESP primitive, sends back the acknowledgment message CGBA

  • marks all circuits as maintenance remotely blocked

NOTE: For ITU97 mode, the MAINTENANCE_SYSTEM_IND indication is received prior to the GROUP_BLOCKING_IND indication.

Figure 20-7 Maintenance Group Blocking - Normal Case

Maintenance Group Blocking - Normal Case

Group Blocking (Hardware Oriented) from Network -
Normal Case

In this scenario, a CGB is received from the network and the CGB is requesting a Hardware oriented blocking operation. As a result, HP OpenCall SS7 ISUP:

  • issues a HW_GROUP_BLOCKING_IND primitive to the application

  • issues a MAINTENANCE_SYSTEM_IND indicating HW_GROUP_BLOCKING

  • waits for the HW_GROUP_BLOCKING_RESP from the application and sends a CGBA message back to the network

  • marks all circuits as remotely blocked

NOTE: For ITU97 mode, the MAINTENANCE_SYSTEM_IND indication is received prior to the GROUP_BLOCKING_IND indication.

Figure 20-8 Hardware-Oriented Group Blocking - Normal Case

Hardware-Oriented Group Blocking - Normal Case

Group Blocking (Maintenance Oriented)
- From User - Normal Case

In this scenario, a maintenance GROUP_BLOCKING_REQ request is sent by the user. Consequently, HP OpenCall SS7 ISUP:

  • sends the CGB message to the network

  • sends a MAINTENANCE_SYSTEM_IND (MN_GROUP_BLOCKING) to the application

  • waits for the CGBA message and issues a GROUP_BLOCKING_CONF (CGBA) primitive to the application

  • marks all circuits as MN_LOCALLY_BLOCKED

The rangeAndStatus parameter is interpreted in the same way as for the CGB message.

NOTE: A RELEASE_IND caused by a HW_GROUP_BLOCKING does not need a RELEASE_RESP.

Figure 20-9 Group Blocking from User - Normal Case

Group Blocking from User - Normal Case

Group Blocking (Hardware Oriented)
- From User - Normal Case

In this scenario, a hardware HW_GROUP_BLOCKING_REQ request is sent by the user. Consequently, HP OpenCall SS7 ISUP:

  • sends the CGB message to the network

  • waits for the CGBA message and issues a HW_GROUP_BLOCKING_CONF(CGBA) primitive to the application

  • marks all circuits as hardware locally blocked

The rangeAndStatus parameter is interpreted in the same way as for the CGB message.

Figure 20-10 Group Blocking from User - Normal Case

Group Blocking from User - Normal Case

Group Unblocking (Maintenance Oriented)
- From Network - Normal Case

In this scenario, a CGU is received from the network. As a result, HP OpenCall SS7 ISUP:

  • informs the application using GROUP_UNBLOCKING_IND

  • waits for the GROUP_UNBLOCKING_RESP, and upon receipt of it, sends a CGUA back to the network primitive to the application

  • marks each of the latter unblocked

A maintenance blocked condition can only be removed by a maintenance oriented group unblocking message.

The rangeAndStatus parameter is interpreted in the same way as for the CGB message.

Figure 20-11 Group Unblocking from Network - Normal Case

Group Unblocking from Network - Normal Case

Group Unblocking (Hardware Oriented)
- From Network - Normal Case

In this scenario, a CGU requesting hardware oriented unblocking is received from the network. As a result, HP OpenCall SS7 ISUP:

  • informs the application using HW_GROUP_UNBLOCKING_IND

  • waits for the HW_GROUP_UNBLOCKING_RESP, and upon receipt of it, sends a CGUA back to the network primitive to the application

  • marks each of the latter unblocked

A hardware blocked condition can only be removed by a hardware oriented group unblocking message.

The rangeAndStatus parameter is interpreted in the same way as for the CGB message.

Figure 20-12 Group Unblocking from Network - Normal Case

Group Unblocking from Network - Normal Case

Group Unblocking (Maintenance Oriented)
- From User - Normal Case

In this scenario, a GROUP_UNBLOCKING_REQ request is sent by the user. Consequently, HP OpenCall SS7 ISUP:

  • sends the CGU message associated with the primitive to the network

  • waits for the CGUA message from the network and issues a GROUP_UNBLOCKING_CONF primitive to the application

  • marks all circuits locally unblocked

Figure 20-13 Group Unblocking from User - Normal Case

Group Unblocking from User - Normal Case

Group Unblocking (Hardware Oriented)
- From User - Normal Case

In this scenario, an HW_GROUP_UNBLOCKING_REQ request is sent by the user. Consequently, HP OpenCall SS7 ISUP:

  • sends the CGU message associated with the primitive to the network

  • waits for the CGUA message from the network and issues an HW_GROUP_UNBLOCKING_CONF primitive to the application

  • marks all circuits locally unblocked

Figure 20-14 Group Unblocking from User - Normal Case

Group Unblocking from User - Normal Case

Group Blocking (Maintenance Oriented)
- During Call Setup Procedure

If one of the circuits present in the CGB message received from the network has issued a SETUP_REQ, an immediate release procedure is engaged by HP OpenCall SS7 ISUP.

Consequently, a SETUP_FAILURE_IND indicating BLOCKING is issued to the application.

Figure 20-15 Group Blocking during Call Setup

Group Blocking during Call Setup

Group Blocking (Hardware Oriented)
- During Call Setup Procedure

If one of the circuits present in the CGB message received from the network has issued a SETUP_REQ, an immediate release procedure is engaged by HP OpenCall SS7 ISUP.

Consequently, a SETUP_FAILURE_IND indicating BLOCKING is issued to the application.

Figure 20-16 Group Blocking during Call Setup

Group Blocking during Call Setup


Circuit Blocking/Unblocking from a Network
  		 


Circuit Group Query  
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