1
General
1.1 Scope
1.2 References
1.3 Definitions
1.4 Abbreviations
2 Test configuration
2.1 Setup for handset
terminal
2.2 Setup for headset
2.3 Setup for speakerphone
set
3 Test conditions
3.1 Test signal
3.2 Test environment
4 Handset technical requirements
4.1 Sending characteristics
4.2 Receiving characteristics
4.3 Sidetone characteristics
4.4 Noise contrast and comfort noise
4.5 Weighted terminal coupling loss (TCLw)
4.6 Stability loss
4.7 Delay
4.8 Speech clipping
4.9 Acoustic safety of
telephone user
5 Headset technical requirements
5.1 Headset sending
characteristics
5.2 Headset receiving
characteristics
5.3 Sidetone
characteristics
5.4 Weighted terminal
coupling loss (TCLw)
5.5 Acoustic safety of
telephone user
6 Speakerphone sets technical requirements
6.1 Loudspeaker sending characteristics
6.2 Speakerphone set receiving characteristics
6.3 Weighted terminal coupling loss
6.4 Switching characteristics
6.5 Double talk performance
6.6 Background noise transmission and comfort noise injection
6.7 Delay