Testing industrall VoIP implementations: registration for SIP phones

Abstract

The Session Initiation Protocol (SIP) is an application-layer control protocol that can establish, modify, and terminate multimedia sessions such as Internet telephony calls. SIP provides a registration service so that the users can upload their current locations for use by proxy servers. A finite-state machine (FSM) model for SIP registration process is presented. The complexity of the SIP registration model is increased due to the concurrent timers, namely retransmission, transaction and registration interval timers, that are running during SIP operations. This FSM model is then used to generate minimum-cost test sequencesfor conformance testing ofSIP telephones manufactured by Avaya. These test cases are planned to be presented to the European Telecommunications Standards Institute (ETSI) Technical Committee Methods for Testing and Specification (MTS) to be adopted as complementary test cases to the existing SIP Test Suite.