# Example of ESB Request – Reply IMS

This IVP example illustrates how a TIBCO messaging client application initiates a request message to invoke an IMS Message Processing Program (MPP). The client uses an IMS message queue via Substation ES.

The IMS MPP replies by putting information into the IO-AREA and inserts it on the IMS message queue. Substation ES picks up the data from there and delivers the reply to the IVP Sender Listener. In both directions, the Substation ES Transformer processes the data conversions based on the selected conversion rules in the recipe.

For more information about the process flow, see the "Messages Flow" section of the TIBCO Substation ES Concepts manual.

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