Trader Identification: FIX tag regulatory requirements As noted in the attached memo of May 6, 2008, all firms are required to submit information in the three FIX tags designated for this purpose. These are tags 115, 116, and 144. Each of these tags contains two data elements, separated by the “pipe” character, and summarized below: FIX API Communication Model. Introduction. FIX API uses Session Based communication. A session is defined as a communication between two parties, the Initiator (Client), who is the party who initiates the communication and the Acceptor (Server), the party who receives the connection request from the Initiator. Time Zone of Tag 6038 (OrderEnteredTime) TT FIX Adapter receives the date and time used to populate Tag 6038 (OrderEnteredTime) from fills from TT Gateways. The fills provide the time in the time zone of the TT client application's machine (X_TRADER, XTAPI, Order Routing FIX Adapters, etc).