Jan Rozhon

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This paper deals with new proposal of a speech quality monitoring tool based on the perceptual evaluation of speech quality in accordance with ITU-T P.862 and its application in a research project investigating an impact of meteorological conditions on the speech quality in a GSM network. Every time we make a call using the GSM network the speech quality(More)
Research in the field of efficient measuring SIP based network elements' performance has been performed in the department of telecommunications in VSB-Technical University of Ostrava for two years now. Since that we have accomplished several significant achievements moving the testing architecture from virtualization-based to multiprocessing one. In this(More)
With Voice and Video over IP spreading to the new areas of mobile communications, the speech quality becomes a concern of high importance. Monitoring systems of various types are deployed massively in the infrastructure of all the providers. These systems provide the knowledge base for the providers to set the infrastructure of theirs properly and(More)
This paper deals with network performance simulation and quality of Triple-play services in IP networks. Based on our designed analytical model, the application has been created by means of which it is possible to predict qualitative parameters for QoS in IP networks, with regard to policies applied for packet processing by routers and with regard to the(More)
The paper deals with speech quality monitoring system using probes placed on individual network nodes operating VoIP (Voice over Internet Protocol) services. The system is developed mainly within research of the Czech educational and scientific network, but the tool can be deployed generally in any VoIP infrastructure. In order to assess speech quality, an(More)
This paper discusses the transmitting video calls and the use of the Voice Extensible Markup Language (VoiceXML, VXML) to create a complex multimedia menu in danger alert communication system. The system was created as a part of research at Department of Telecommunications at the VSB - Technical University of Ostrava. Creating a multimedia menu provides(More)