Hi,

Just recently implemented a PAS to A&E messaging system using BTAH7.  The
system delivers HL7 messages to a listening port on the A&E server - I'm am
not concerned with reading or gathering back ACKs so there is no correlation
involved.

However the target system's interface behind the MLLP port processes these
inputs received from BizTalk one at a time in a synchronous fashion, blocks
the port until it can construct an ACK response which it then duly passes
back out the same port.  Once this operation is complete the port listens
once again.  Now I'm already asking the vendor to try a more asynchronous
approach, make the MLLP port a receiving port only, process every message it
gets in it's own time, and return an ACK from another port - this way should
I ever become interested in the ACKs I can pick them up and correlate.

However, I was wondering is there a way to throttle the message delivery
from the physical Send Port? - Queue the messages for delivery contigiously?
How do Microsoft handle a form of delivery to a target system that wants to
handle messages in a more synchronous fashion, and should block until the
ACK is created?  Could an orchestration be used to overcome my problem? Just
in case the A&E system vendor come back to me and say they cannot change the
default behaviour of their MLLP port?

thanks in advance,
Mig

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