IBM MQ and asynchronous callout requests

IBM MQ supports asynchronous callout requests from the ALT IOPCB interface.

OTMA can be configured with destination descriptors for IBM MQ applications. The MQ message descriptor (MQMD) data structure expected by IBM MQ contains fields that control MQ message handling. The OTMA descriptor contains parameters to configure the MQMD structure, which can be set either with the DFSYDTx member of the IMS.PROCLIB data set, or with type-2 commands.

A descriptor that matches the destination sets the default routing and message handling parameters. However, you can use the OTMA routing exits (DFSPRX0 and DFSYDRU0) to override the routing information in the destination descriptor if they are enabled with the EXIT=YES parameter for that descriptor.