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The popularity of multimedia services over the Internet has grown heavily in recent years, and software phones and videophones have become one of the major IP telecommunication applications of interest for desktops or handheld PCs. In this paper we present a platform independent soft phone application, based on Java programming language, which is able to inter-operate in a pre-existent media gateway control protocol (MGCP) framework, in order to extend the already present LAN telephony capabilities, based on the adoption of hardware VoIP (voice over IP) telephones. The application presented in this paper has been entirely developed in Java: it can run on any platform having a JVM (Java virtual machine) installed. The prototype performance evaluation showed that JavaNetPhone interacts correctly with the VoIP gateway and the other phones on the LAN, giving acceptable voice quality.