Automated generation of TTCN-3 test scripts for SIP-based calls

The complexity of modern telecommunications systems implies the need for thorough and systematic software testing. Software testing is an expensive and time-consuming task involving specification of what and how to test, and preparation of test descriptions in a format that is accepted by the test equipment. To cut down the cost of manual testing and to increase its reliability, steps may be taken to automate the whole test case preparation process. The Testing and Test Control Notation Version 3 (TTCN-3) is an internationally standardized language for defining test specifications for a wide range of computer and telecommunication systems. It allows the concise description of test behavior by unambiguously defining the meaning of a test case pass or fail. In this paper, we describe a model for automatic test generation, and describe an implemented solution for automatic generation of TTCN-3 test scripts based on parsing SIP call traces. The implemented solution is tested using TITAN, a TTCN-3 test execution environment developed in Ericsson.