Message Type Indicator
This is a 4 digit numeric field which classifies the high level function of the message. A message type indicator includes the ISO 8583 version, the Message Class, the Message Function and the Message Origin, each described briefly in the following sections. The following example (MTI 0110) lists what each digit indicates:
0xxx -> version of ISO 8583 (1987 version) x1xx -> class of the Message (Authorization Message) xx1x -> function of the Message (Request Response) xxx0 -> who began the communication (Acquirer)Read more about this topic: ISO 8583
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