IITID (16-byte bit string)

Transaction instance identifier.

This field is used by output messages from IMS so is ignored on first input. If IITST is set to ITSIC, this must be provided in the next input, and all subsequent inputs, to enable IMS to correlate the messages to the correct conversation. The following special value may be used:

ITINON

No transaction instance id.

The length of this field is given by LNTIID. The initial value of this field is ITINON.