As part of their FixProxy Spec, CboeFX supports:
On CboeFX Taker Feeds, the Client can send Day and IOC orders. Market Day orders are supported on SPT ECN but not on NDF ECN.
TIF=DAY - Once an order is placed, if the order is not executed immediately, it stays active with OrdStatus=New and if unfilled gets cancelled only at the end of trading day. TIF=IOC - Once an order is placed, if the order is not executed immediately, it will be automatically expired.The ExecutionReport providrd additional information in the Text field as follows:
Further detail is provided in the following page(s):