Christian Hoene Sven Wiethölter Adam Wolisz Predicting the Perceptual Service Quality Using a Trace of VoIP Packets. 21-30 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3266&spage=21 2004 conf/qofis/2004 QofIS db/conf/qofis/qofis2004.html#HoeneWW04