Reply messages from IMS

When an IMS transaction ISRTs to its IOPCB, the message is routed back to the originating LTERM or TPIPE.

These are seen in IBM MQ as reply messages. Reply messages from IMS are put onto the reply-to queue specified in the original message. If the message cannot be put onto the reply-to queue, it is put onto the dead-letter queue using the authority of the bridge. If the message cannot be put onto the dead-letter queue, a negative acknowledgment is sent to IMS to say that the message cannot be received. Responsibility for the message is then returned to IMS. If we are using commit mode 0, messages from that Tpipe are not sent to the bridge, and remain on the IMS queue; that is, no further messages are sent until restart. If we are using commit mode 1, other work can continue.

If the reply has an MQIIH structure, its format type is MQFMT_IMS; if not, its format type is specified by the IMS MOD name used when inserting the message.

Parent topic: How the IMS bridge deals with messages