CONTENTS

 1     Scope
 2     Normative references
 3     Abbreviations and definitions
        3.1     Abbreviations
        3.2     Definitions
 4     Interpreting INMD measurements
        4.1     Single call measurements
        4.2     Multiple call measurements
        4.3     Sample size
                  4.3.1     Confidence Intervals for Measurement Averages
                  4.3.2     Confidence intervals for thresholding
 5     Impact of INMD location in the network
        5.1     Context
        5.2     INMD location at the outgoing side of the international gateway
                  5.2.1     Advantages
                  5.2.2     Disadvantages
        5.3     INMD location at the incoming side of the international gateway
                  5.3.1     Advantages
                  5.3.2     Disadvantages
        5.4     Comparative impact of both scenarios on the measures recommended in P.561
        5.5     Discussion
        5.6     Conclusion
 6     Using INMD measurements to predict average customer opinion
        6.1     Using a model to predict customer opinion
        6.2     Assumptions
        6.3     Model
                  6.3.1     Network and speaker assumptions
                  6.3.2     Assumptions model
                  6.3.3     Loss and noise perception model
                  6.3.4     Echo and delay perception model
                  6.3.5     Model output
        6.4     Predictions
                  6.4.1     Single call clarity index values
                  6.4.2     Multiple call clarity index values
        6.5     Diagnostics using an opinion model
 7     Using INMD measurements for network planning
 8     Using INMD measurements to maintain networks
        8.1     Objectives provided by Recommendations in the G series
                  8.1.1     Objectives for speech level measurements
                  8.1.2     Objectives for noise measurements
                  8.1.3     Objectives for echo power measurements
                  8.1.4     Objectives for echo path delay
        8.2     Additional thresholding techniques used to direct maintenance
Annex  A – Call Clarity Index model description
        A.1     Introduction
        A.2     Model equations
                  A.2.1     Echo and delay multiplier, E
                  A.2.2     Pre-echo opinion score, Y_Cpre-echo
        A.3     Model output
        A.4     Weighting values
                  A.4.1     Loudness ratings weightings
                  A.4.2     LOI weightings
        A.5     Assumptions/Data files
                  A.5.1     Speaker and listener data values
                  A.5.2     Telephone data values
                  A.5.3     Noise data values
        A.6     Miscellaneous equations
Annex  B – Mapping INMD measurements to the E-model
        B.1     Algorithms relating INMD measurements to E-model parameters
                  B.1.1     Algorithms relating INMD measurements to the E-model's loss parameters
                  B.1.2     Algorithms relating INMD measurements to the E-model's noise parameters
                  B.1.3     Algorithms relating INMD measurements to the E-model's echo parameters
                  B.1.4     Equations for the E-model using INMD measurements
Appendix  I – Details on the comparison of INMD location within the network
Appendix  II – Statistical techniques for use on multiple INMD measurements
       II.1     Confidence intervals
       II.2     Hypothesis test for the mean of a set of measurements versus a fixed value
       II.3     Hypothesis test for the means of two sets of measurements
Appendix  III – Statistical techniques for use on INMD threshold calculations
      III.1     Introduction
      III.2     Theoretical approach
      III.3     Approximation