This paper reports on the experience and results obtained from a voice quality assessment of a commercial available ATM-like packetized system. The system is designed to integrate voice, video, frame relay and other types of data over a wide range of transmission facilities. Typically the system will be organized in a network. Both voice and data compression techniques are provided. The aim of the voice quality assessment was to investigate how users judge the different compression rates compared with each other. The assessment was based on a subjective listening test method. This paper gives a description of the test equipment, an automatic voting equipment, and the listening test method. Finally the results of the assessment are reported.