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Environment/Versions TTworkbench 32/64 Bit Linux/Windows Answer The information must ne taken out of the message itself. The decoding hypothesis doesn't give the answer which type in the union is needed. Example: In the TTworkbench built-in example, AddressBookMessageBased,  see the TTCN-3 union Contact defined in the module AddressBookMessageBased.ttcn3 and how it is decoded in the codec class AddressBookMsgCodec.java by the method private void decodeContact(byte[] message, UnionValue contact) {...}