A method, computer system and computer program product for determining a probability that a particular network segment in a telephony network is responsible for poor audio quality associated with a telephone call being transmitted over the telephony network, is provided. A plurality of parameters associated with a telephone call are identified. The plurality of parameters are indicative of audio quality. A probability that a particular network segment is responsible for poor audio quality associated with the telephone call is calculated based on the plurality of parameters. The probability that a particular network segment is responsible for the poor audio quality associated with the telephone call is a function of at least one of the i) duration of the call and ii) call disconnect time relative to call answer time.