Rec. ITU-T Series P Supplement 22 (03/1993) … TRANSMISSION CHARACTERISTICS OF WIDEBAND AUDIO TELEPHONES
FOREWORD
CONTENTS
1 Introduction
2 Handset sending characteristics
    2.1 Levels
    2.2 Sensitivity/frequency characteristics
    2.3 Noise
    2.4 Distortion
    2.5 Discrimination against out-of-band input signals
3 Handset receiving characteristics
    3.1 Levels
    3.2 Sensitivity/frequency characteristics
    3.3 Noise
    3.4 Distortion
    3.5 Spurious out-of-band receiving signals
4 Handset sidetone characteristics
5 Handset echo path loss characteristics
6 Hands-free sending characteristics
    6.1 Levels
    6.2 Sensitivity/frequency characteristics
    6.3 Noise
    6.4 Distortion
    6.5 Discrimination against out-of-band input signals
7 Hands-free receiving characteristics
    7.1 Levels
    7.2 Sensitivity/frequency characteristics
    7.3 Noise
    7.4 Distortion
    7.5 Spurious out-of-band receiving signals
8 Hands-free echo path loss characteristics
9 Hands-free switching characteristics
10 Delay
Annex A … Objective measurement methods for wideband audio telephones
A.1 Introduction
A.2 Electrical interface specifications
A.3 Electro-acoustic measurement considerations
A.4 Handset measurement methods
A.5 Hands-free measurement methods