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Korhonen J (2002)
IP-protocol based telephony network service development by software process.
M.Sc. thesis, Department of Electrical Engineering, University of Oulu, Finland (in Finnish).

This thesis work presents a guideline framework for supporting the software development of IP-based telephony services. The guidelines improve the following stages of an object-oriented software development process: requirement specification, analysis, and architectural design. The guideline-framework presents the following features to be defined: telephony services environment, detailed composition and deployment of services into the environment. A list of questions has been formulated to support the definition task. A Java-based software development toolkit was implemented to apply the guidelines. The toolkit is used to develop IP-telephony network signalling components. The toolkit was used to build the telephony network's basic components, which accept user registrations, relay signaling messages, and enable the real-time monitoring of users' presence status. The guidelines were applied to a software project for developing a multi-user conferencing service. The conferencing service was targeted for use by MediaTeam research group personnel. Service development was a part of the Duchess research project. Use of the guidelines aided in the resolution of technical problems in the conferencing service and they were used for preliminary estimates of the impact of the new service to the environment.