First ISCA ITRW on Auditory Quality of Systems
April 23-25, 2003
This paper describes a series of four conversation tests, which were carried out in order to assess speech quality under degradations occurring in combined PSTN/ISDN/VoIP networks. Based on the test results, the validity of predictions by the model currently recommended by the ITU-T for network planning (the E-model, ) is discussed.
Bibliographic reference. Raake, Alexander (2003): "Speech quality of heterogeneous networks involving VoIP: Are time varying impairments additive to classical stationary ones?", In AQS-2003, 63-70.