1 Scope
2 References
3 Abbreviations and definitions
3.1 Abbreviations
3.2 Definitions
4 General considerations
4.1 Parameters describing speech transmission quality (including terminals)
4.2 Test setup for terminals
4.3 Test setup for echo cancelling devices
4.4 Test signals for conversational evaluation
5 Evaluation of the conversational situation
5.1 Double talk performance
5.2 Subjective evaluations
5.2.1 Conversational evaluation
5.2.2 Specific double talk tests and listening only tests
5.3 Objective evaluations
6 Guidance on the improvement of conversational speech quality
6.1 Delay and echo
6.2 Background noise transmission
6.3 Double talk performance
6.4 Quality of speech sound and loudness