Voice-over Internet protocol (VoIP) has become more popular because of the widespread use of the Internet. The quality of VoIP phone calls is typically not as stable as that in the public switched telephone network. This is because of the packet-switching approach of IP networks. This situation is very common for a mobile device that connects a VoIP call through a wireless link. Therefore, properly managing the quality of service for VoIP calls is important. Some objective methods are developed to evaluate subjective qualities. They are based on the physical system. This study is based on statistical quality control and the process capability index to evaluate VoIP's performance, then demonstrates the entire system's service quality. The acceptable thresholds of two critical characteristics in voice-quality transformation, including packet loss and delay, are regarded as processing specifications. Our method measures the process capability of every phone call item to meet processing specifications where multiple phone call quality characteristics are involved.
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