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This paper evaluates the performance of VoIP services over mobile accesses, with special focus on currently deployed Best Effort UMTS networks. There are different configuration parameters that have a great impact on end users' perception of quality. This paper tries to help understanding the impact of those parameters, and how they can be tuned for a better VoIP experience. The Voice over IP (VoIP) service has gained a remarkable relevance over the last few years. Several factors have influenced this growth. The development of new voice codecs allows providing an acceptable listening quality at low bandwidth demands.
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