Towards a universal value scale for quantifying the quality of speech communication across services

This paper reports on ongoing work in ITU-T Study Group 12 on developing a universal scale quantifying quality across different types of speech communication services. In contrast to a quality rating scale, this scale should be deliberated from the judgment context as far as possible. As a consequence, it should be possible to compare different types of services on such a scale, in order to justify investments made in comparison to QoE gains to be expected. The paper explains the underlying rationale of such a scale, defines the requirements it has to fulfill, and outlines the way to its derivation. It invites further discussion to this work item of ITU-T Study Group 12, and could serve as an example for other types of services.