Software as a service: A voice communication application developed using service-oriented architecture

When we look at the software development processe over the last 25 years, we see that each step is a complement and enhancement over the previous step. Service-Oriented Architechture (SOA) is a recently developed software architechture approach that utilizes fast developing web technologies. The difference with SOA is that software components interact with each other and other software applications via service calls, software applications utilize other applications via services. A recent consequence of SOA is to make software applications available for use remotely via an approach called Software as a Service (SaaS), in which not just certain funtionalities of software is made available via services, but the whole software is made available for use remotely as service via licensing. SaaS approach is currently being accepted as an economical and functional model.In this thesis, we investigate SaaS, its techniques, methods, and its benefits. We also present a voice communication application that we developed using SaaS approach.