6.12 Echo control characteristics

6.13 Clock accuracy

6.6 Stability loss

6.7 Echo control

6.9 Void

6.10 Sending performance in the presence of ambient noise

6.8 Distortion

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

6.4.6 Hand-held hands-free UE receiving

6.4.5 Hand-held hands-free UE sending