The session initiation protocol (SIP) is a signaling protocol for Internet telephony, multimedia conferencing, presence, event notification, and instant messaging. With the gaining popularity, more and more SIP implementations have been developed and deployed. How to guarantee the conformance of those SIP implementations is the key point of interconnection and interoperation among them. This paper proposes the test method and architecture for the SIP protocol based on the IPv6 tester system. Tree and tabular combined notation (TTCN-2) is adopted to describe the test suite. With an enhanced reference implementation, the data-processing ability to the original test system has been greatly improved. In the following test practices, some errors have been found in the SIP entities under test. It is proved that the proposed test method and architecture are effective to verify the conformance of the SIP entities, and the result of the conformance test may provide helpful reference to the development of SIP products.
The protocol testing technology used in the next generation Internet should satisfy some new challenges and requirements. This paper focuses on the test suite de-scription and test implementation techniques. TTCN-3 is chosen as the test suite description language and extended in both syntax and semantics to satisfy the requirements of protocol robustness testing. PITSv3,a protocol integrated testing system based on TTCN-3,is developed,and the extensions for robustness testing are implemented. Finally,two practical test applications are presented.
YIN Xia1,3,WANG ZhiLiang2,3,JING ChuanMing1,3 & SHI XinGang2,3 1 Department of Computer Science and Technology,Tsinghua University,Beijing 100084,China
Interoperability testing is an important technique to ensure the quality of imple-mentations of network communication protocol. In the next generation Internet protocol,real-time applications should be supported effectively. However,time constraints were not considered in the related studies of protocol interoperability testing,so existing interoperability testing methods are difficult to be applied in real-time protocol interoperability testing. In this paper,a formal method to real-time protocol interoperability testing is proposed. Firstly,a formal model CMpTIOA(communicating multi-port timed input output automata) is defined to specify the system under test(SUT) in real-time protocol interoperability testing;based on this model,timed interoperability relation is then defined. In order to check this relation,a test generation method is presented to generate a parameterized test behavior tree from SUT model;a mechanism of executability pre-determination is also inte-grated in the test generation method to alleviate state space explosion problem to some extent. The proposed theory and method are then applied in interoperability testing of IPv6 neighbor discovery protocol to show the feasibility of this method.
WANG ZhiLiang1,3,YIN Xia2,3 & JING ChuanMing2,3 1 Network Research Center,Tsinghua University,Beijing 100084,China
