CONTENTS

 1     Scope 
 2     References 
 3     Definitions and abbreviations        
        3.1     Definitions 
        3.2     Abbreviations        
 4     Test configuration
        4.1     Measurement approaches for testing digital telephones        
        4.2     Test equipment      
        4.3     Measurement set-up          
        4.4     Test environment   
        4.5     Test signal and level           
        4.6     Accuracy of test equipment
 5     Handset technical requirements    
        5.1     Sending characteristics       
        5.2     Receiving characteristics    
        5.3     Sidetone characteristics      
        5.4     Echo path loss characteristics         
        5.5     Delay     
 6     Headset technical requirements    
        6.1     Sending characteristics       
        6.2     Receiving characteristics    
        6.3     Echo path loss characteristics         
Annex A – Distortion allowances    
Bibliography