Foreword
1 Scope
2 Normative references
3 Definitions and abbreviations
  3.1 Definitions
  3.2 Abbreviations
4 D-channel characteristics
5 In-band signalling characteristics
6 Transmission characteristics
  6.1 Relative level
  6.2 Signal encoding
  6.3 Signal decoding
  6.4 Speech transmission characteristics
Annex A (normative): Test methods
  A.1 General conditions for testing
  A.2 Testing of transmission requirements
Annex B (informative): Delay measurement methods
  B.1 Introduction
  B.2 Cross-correlation method
  B.3 Method based on group delay
Annex C (informative): Bibliography
History