CONTENTS

 1     Introduction
 2     Instrumentation
        2.1     Artificial ear
        2.2     Artificial voice
        2.3     Electrical termination
        2.4     Electrical signal source
        2.5     Recording and measurement system
        2.6     Diffuse room noise source
 3     Measurements
        3.1     Send loudness rating (SLR)
        3.2     Receive loudness rating (RLR)
        3.3     Sidetone masking rating (STMR) (Talker Sidetone)
        3.4     Listener sidetone rating (LSTR)
        3.5     Overall loudness rating (OLR) [Overall Send + Receive (OSR)]
        3.6     JLR Junction loudness rating