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VoIP service exposes weakness on quality on QoS and reliability as it manages voice and data service together on a network. This paper diagnoses characteristic of voice quality on IP network as the question arises per VoIP service. It also diagnoses the characteristics of service quality and the problem of VoIP per H.323 protocol suite. For this reason, this paper proposes that VoIP QoS can be provided by managing the weakness of VoIP related protocol with design of measurement management process model for VoIP QoS. Furthermore, it proposes the use of analysed item and quality item driven per voice service from VoIP service quality measurement value of the site utilizing VoIP Service can increase the quality. It is proposed that the result of MOS, delay, jitter, loss value acquired per VoIP QoS as proposed can be used to assure the quality of signal, voice processing, filtering, security function, etc.