EG 201 474 : 1.1.1

Intellectual Property Rights
Foreword
Introduction
1 Scope
2 References
3 Definitions and abbreviations
  3.1 Definitions
  3.2 Abbreviations
4 Background
5 General
  5.1 Factors affecting speech transmission quality
  5.2 Assessment of speech transmission quality
  5.3 Control of speech transmission quality
  5.4 Voice band traffic
  5.5 Automatic speech transmission quality system
  5.6 Transmission impairment
6 Signalling requirements to support end-to-end speech
  transmission quality
  6.1 Network configuration
  6.2 Use of VQoS information
  6.3 Speech transmission quality categories
  6.4 User strategies and issues
  6.5 Signalling parameters
  6.6 Interim issues
Annex A (informative): Transmission impairment
      A.1 Transmission impairment types
Annex B (informative): Speech transmission quality ratings
Annex C (informative): Example ANF service description
      C.1 Scope
      C.2 References
      C.3 Definitions and abbreviations
      C.4 Specification of the ANF
Annex D (informative): QoS - IP performance vs. Speech Quality
      D.1 Introduction
      D.2 PDV effect on Speech Quality
      D.3 Conclusion
History

Identifies trends in the design of networks and choices of technology that affect speech transmission quality and are expected to lead to a wider range of quality levels that will be experienced by callers. It reviews the implications of the ITU definitions of call quality categories and identifies the main impairment factors that need to be managed in order to provide specified levels of quality. Establishes the options for exchanging information between interconnected networks and concludes by specifying a "Stage 1" type of description for the exchange of quality parameter information about individual calls.