Acknowldegement in asynchronous scenario: is it sync or async

Dear community,
in an asynchronous scenario with a fault message type defined for the inbound interface, the handover of a message from XI to receiver consists of two steps:
Step 1: XI will send a message to the receiver
Step 2: The receiver will acknowledge positively or negatively.
Will Step 1 and Step 2 be handeled synchronously or will it be handeled asynchronously for async scenarios ?
The background of this question is resource-related. If the processing of a message is synchronous, processing of these two steps would block resources, which would be problematic for higher volumes.
Logically it seems as if this would all be async but I could not find a detailled spec and I need to know for sure.
Thanks a lot in advance !
Jochen

Hi Jochen,
if you want to have the result of a message at the receiver you have 2 alternatives:
Synchronous:
+You get the errors at once
+You know very soon, what happend
-Bad performance, bcoz processing time may be for minutes stopped
-no connection (receiver offline) leads to an error
Asynchronous with acknowledgement:
-You get only sometimes an error acknowledgement
-The calling programm has no direct information
+Much better performance
+Queing mechanism allows automaticly and manually restart
Usually you try to build, if possible, asynchronous scenarios. But it depends on requirements.
Regards,
Udo

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