Today, an increasing number of carriers and service providers are compelled to transition away from TDM technologies—which are rapidly going obsolete—toward modern packet-based approaches. And it should come as no surprise, since packet-based networks can deliver the best possible system performance, guarantee their ability to support both legacy and new business services, and reduce operational costs related with the management, support, and maintenance of multiple networks and aging infrastructures. This results in savings not only for service providers, but also for end-users who will benefit over time from much higher-speed services at generally lower recurring costs.