This number uniquely identifies the interconnect mailbag to the interconnect entity sender; It is assigned by the interconnect entity sender; Together with the sender ID, it uniquely identifies the interconnect mailbag to the interconnect entity receiver; It is suggested that the interconnect entity sender and the interconnect entity receiver be able to maintain an audit trail of interconnect mailbags using this number; Each interconnect mailbag that is created by the sender should contain a unique control number; Interconnect mailbags that require retransmission should not have their control number changed

Code indicating the status of receipt by the interconnect entity receiver of the interconnect mailbag and the actions to be taken, if any

Code indicating the nature of the error detected in the received interconnect mailbag by the interconnect entity receiver

Code indicating the nature of the error detected in the received interconnect mailbag by the interconnect entity receiver

Code indicating the nature of the error detected in the received interconnect mailbag by the interconnect entity receiver

Code indicating the nature of the error detected in the received interconnect mailbag by the interconnect entity receiver

Code indicating the nature of the error detected in the received interconnect mailbag by the interconnect entity receiver