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Environment/Versions TTworkbench 32/64 Bit Linux/Windows Answer The developers coming from the telecom world, where everything is message-driven, may have problem to understand the concept behind triCall. The procedure-based approach is used to test middleware platforms respectively software. You may want to test your own written java methods. For this you can use the procedure call to call your method and check the reply value etc. The triCall is an interface method of TriCommunicationSA and will be called every time using the call statement in TTCN-3. Further information can be found  in the TTworkbench built-in example AddressBookProcedureBased and in the TTCN-3 Standard https://www.etsi.org/deliver/etsi_es/201800_201899/20187305/04.07.01_60/es_20187305v040701p.pdf