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The basic provision for the introduction of global- reach services, such as Voice over IP (VoIP), in the next generation heterogeneous IP networks is the ubiquitous reachability of IPv4, IPv6, and dual stack hosts. For undisturbed service operation in different stages of network evolution the deployment of most suitable transition mechanisms supporting interconnection of IPv4 and IPv6 networks is of great importance. The careful selection of mechanisms is needed as different configuration of transition mechanisms along the service path may have different impact on the service performance. The work presented in this paper aims at performance characterization of a number of networking scenarios in which SIP-based VoIP applications interwork with different IPv4-IPv6 transition mechanisms. This application specific performance characterization is an important input for network transition and service deployment decisions.