Speech Quality Measurement in IP Telephony Networks by Using the Modular Probes

  • Filip Rezac
  • Jan Rozhon
  • Jiri Slachta
  • Miroslav Voznak
Conference paper
Part of the Communications in Computer and Information Science book series (CCIS, volume 522)


The paper presents a system for monitoring the speech quality in the IP telephony infrastructures using modular probes that are placed at key nodes in the network. The system is developed mainly within research of the Czech educational and scientific network, but the tool can generally be used in any IP telephone traffic. The system is capable of using an objective intrusive methods to measure speech quality dynamically and the results are collected on a central server. Information about the speech quality are displayed in the form of automatically generated maps and tables. The article is logically divided into a description of the technology and algorithms, as well as the implementation procedure is presented and measured results were validated in real traffic. Contribution of the work consists of a new system design utilizing modular probes for the measurement of speech quality in IP telephony networks and the result of applied research enables administrators to respond and optimize network traffic efficiently.


IP telephony Modular probes Speech quality PESQ Network monitoring 



This work has been supported by the Ministry of Education of the Czech Republic within the project LM2010005.


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Copyright information

© Springer International Publishing Switzerland 2015

Authors and Affiliations

  • Filip Rezac
    • 1
  • Jan Rozhon
    • 1
  • Jiri Slachta
    • 1
  • Miroslav Voznak
    • 1
  1. 1.CESNET, z.s.p.o.Prague 6Czech Republic

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