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VoIP technology becomes more and more profitable and many people prefer this kind of connection instead of classic TDMA telecommunication network. Very helpful is a fact that with voice services becomes another related services like a video, a text or even a file transmission. These services are integrated both into simple software VoIP clients and hardware VoIP telephones. The usage of this type of the communication is very cost effective especially in the international connections. One single disadvantage of this technology is dependence on an internet connection quality. For example a delay of a mobile internet connection causes a huge decrease of the quality of service which is the most used parameter in VoIP networks. We can distinguish many factors affecting a quality of speech, such as packet delay, jitter, noises, etc. This paper deals with an impact of the saturation of a speech signal to the subjective voice quality.