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MSH Segments

The MSH segment is the MeSsage Header segment. Every HL7 message starts with an MSH segment. This segment contains the following information that's relevant to an ACK message:

LocationInformationDescription
MSH.3 - MSH.6Sending Application (MSH.3), Sending Facility (MSH.4), Receiving Application (MSH.5), Receiving Facility (MSH.6)Indicates what application generated the message, and what facility generated the message.
MSH.10Message Control IDUnique ID for the message being sent. This is used by the receiving system to distinguish between messages being sent to them.
MSH.12Version IDAllows the sending system to indicate which version of the HL7 standard that their message complies with.

For the inbound parsing of each message you want to acknowledge, it is important to store the message control ID and possibly other parameters like the sender, version, etc.

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