The HL7 Gateway terminates MLLP sessions from hospital senders, parses HL7 v2.x payloads, returns ACK/NAK promptly and archives the raw message before any mapping occurs.
Trust boundary
This is the outermost hospital interface. Nothing unauthenticated reaches the HL7 Parser or downstream clinical stores.
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Listens on MLLP TCP port for HL7 messages.
Parses HL7 v2.x messages into structured form.
Sends ACK / NAK responses to senders.
Writes raw messages to encrypted archive.
The MLLP Listener accepts the TCP session and frames the payload.
The HL7 Parser turns segments into a structured message; malformed payloads get NAK.
The ACK Sender responds to the hospital while the Archive Writer persists the raw bytes to encrypted storage — before EMPI or encounter writes begin.