A secure VoIP conference system: Architecture analysis and design issues

Abstract

In this paper we present the architectural design of a secure VoIP conference system for mobile devices, which is using the strong security mechanisms of the Z Real Time Transport Protocol (ZRTP). We also provide implementation fundamentals of the proposed system. We analyze the core elements and we present the primitive characteristics of the component applications. Our approach follows the Client-Server model for packet relaying and subsidiary procedures like user sign-in and the direct client connection model for key exchange between the users. Experimental results regarding the performance of our prototype show that the processor overhead and the time delay are low, while the system scales well for more than 6 participants in real world conditions. Copyright 2007 ACM.