How to handle Undelivered messages when the Target Application is down

Hi
in our scenario,
sapEccSystem>OuboundProxy>PI>ReceiverAdapter>ReceiverThirdPartyApplication
the known issue with the ReceiverThirdPartyApplication is, it gets down in frequent intervals, and automatically gets up and running, but we don't know at what times it will be down and when it will be up again.
in this asynch scenario, when the scenario gets triggered from source SAP system, and at that time, if the receiverAppl is up, it is working fine.
but when the scenario gets triggered from source SAP system and at that time if the receiverAppl is down, the message exchange gets failed
to address these kinds of issues,
1. is their any concept of Queuing or anything in PI, that can keep the messages in something like Queues and process them when the receiver application gets up., if yes how can configure them
Does PI act as Queuing server, so that it delivers the pending messages one ofter another, until they are all finally sent.
or
2.is there any retry mechanism, where can specify something like, the undelivered message needs to be resent after waiting for an hour.
thanks,
Madhu_1980

Hi, the number of retries and the retry interval are modifiable java system parameters of the [Service SAP XI Adapter: XI|http://help.sap.com/saphelp_nw04s/helpdata/en/29/22ee41c334c717e10000000a155106/content.htm], check section Properties Related to Outbound Processing. You can change these properties in NWA of PI under Configuration Management -> Infrastructure -> Java System Properties -> Services -> XPI Adapter: XI. The screen in the bottom with the heading Extended Details displays the adapter's service property.
I found these properties in oss Note 730870 - FAQ XI 3.0/ PI 7.0/ PI 7.1/ PI 7.11/ PI 7.2/ 7.3 RFC Adapter, under Q3, when doing research on another topic.
Regards, Martin

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