Computer network technologies have been growing explosively and the study in computer networks is being a challenging task. To make this task easy, different users, researchers and companies have developed different network modelling and simulation (MS) tools. These network MS tools can be used in education and research as well as practical purposes. They vary with their characteristics. This paper reviews some of the most important network MS tools developed recently. This paper also shows a classification of the tools used in communications networks.

This paper outlines an approach toward extending the OSGi (Open Services Gateway Initiative) framework to support interoperability with mobile devices. The approach is based on the use of SIP (Session Initiation Protocol), which is likely to be employed by nextgeneration mobile networks. The extensions to OSGi allow a SIP device to participate in an OSGi platform and allow OSGi services to be exported into a mobile (SIP-based) environment. In this paper, we propose an architecture supporting the integration of SIP with OSGi, provide some application scenarios and describe the details of the SIP Service for OSGi.

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