ZyXEL Communications ADSL VoIP IAD with 802.11g Wireless 2602HW Series - Manual (Page 143)

Prestige 2602HW Series User’s Guide
Chapter 10 Voice Screens 143
10.6.1 Voice Activity Detection/Silence Suppression
Voice Activity Detection (VAD) detects whether or not speech is present. This lets the
Prestige reduce the bandwidth that a call uses by not transmitting “silent packets” when you
are not speaking.
10.6.2 Comfort Noise Generation
When using VAD, the Prestige generates and sends comfort noise when you are not speaking.
Comfort noise uses the lowest possible transmission bandwidth to match the background
noise. The comfort noise lets the person at the other end of the connection know that the line is
still connected (total silence would easily be mistaken for a lost connection).
10.6.3 Echo Cancellation
G.168 is an ITU-T standard for eliminating the echo caused by the sound of your voice
reverberating in the telephone receiver while you talk.
10.7 Phone Configuration
Click Voice in the navigation panel and then Phone to display the following screen.
Figure 54 Phone