ABSTRACT
Voice over IP (VoIP) is an attractive choice for voice transmittal compared to traditional circuit-switching technology for the following reasons: lower equipment cost, integration of voice and data applications, lower bandwidth requirements, widespread availability of IP, and the promise of novel, value-added services [1]. In future, VoIP services will be expected to operate seamlessly over a converged network referred to as a Next Generation Network (NGN), comprising a combination of heterogeneous network infrastructures, including packet-switched, circuit-Switched, wireless, and wireline networks.
