7.9 Void

7.8 Distortion

7.10 Sending performance in the presence of ambient noise

7.7 Echo control

7.4.7 Electrical interface UE sending

7.5 Sidetone characteristics (handset, headset, and analogue electrical interface UE)

7.4.8 Electrical interface UE receiving

7.6 Stability loss

7.4.6 Hand-held hands-free UE receiving

7.4.4 Desktop hands-free UE receiving