IBM® Rational® TTCN Suite is an automated software testing tool for communications systems that uses the standards-based test script language, TTCN-2. With Rational TTCN Suite, you can test telecommunications and data communications equipment for compliance with telecommunications standards issued by the European Telecommunications Standards Institute (ETSI) and the International Organization for Standardization (ISO). Rational TTCN Suite is used worldwide as the standard environment for compliance testing of communications systems.