Research Of SIP Conformance Testing

SIP is an application-layer protocol that can establish, modify, and terminate sessions that have one or more participants .SIP can be used in IP phone, IMP, Video conference, IMS, etc. There are lots of SIP implementations; so we need the SIP conformance testing to specify the implementations' conformance to the SIP related RFCs and related specifications, which will ensure the interoperability of the implementations with other implementations in the market.Protocol testing is to verify the correctness and validity of the protocol implementation. Protocol testing is composed of conformance testing, interoperability testing, performance testing etc. The development of conformance testing is most early and maturely, and it is the basement of other testings. A protocol implementation that can pass the conformance testing is more likely to pass the interoperability testing or other testing.This paper has studied protocol conformance testing methodology and testing description language—TTCN-3, and analysed SIP and SIP related protocols. After study of ETSI and TAHI SIP conformance testing specifications, two SIP conformance testing platforms have been established. During the test, some insufficiency in ETSI SIP conformance testing specification are found, so this paper has added some TPs and realized them as ATS with TTCN-3 to solve this problem. As a result, this paper has improved the ETSI SIP conformance testing specification.