ZyXEL Communications MAX208M2W SERIES, User Manual

Page: 159 / 200

Chapter 11 The VoIP Line Screens
MAX208M2W Series User ’ s Guide
159
11.3 Voice
Click VoIP > Line 1 (or Line 2 ) > Voice to configure voice settings.
Figure 74 VoIP > Line 1 (or Line 2) > Voice
The following table describes the labels in this screen.
11.4 Profile
Click VoIP > Line 1 (or Line 2 ) > Profile to maintain settings that depend on
which region of the world the MAX208M2W Series is in.
Figure 75 VoIP > Line 1 (or Line 2) > Profile
Table 58 VoIP > Line 1 (or Line 2) > Voice
LABEL DESCRIPTION
VAD - Voice Activity Detection
Voice Active
Detector
Select one of the following Silence Suppression option to have the
MAX208M2W Series stop transmitting voice traffic when you are not
speaking using the detection method. This reduces the bandwidth the
MAX208M2W Series uses.
• Silence Suppression - NO CNG
• Silence Suppression - Only G.711 Annexll Type
• Silence Suppression - Codec Specific CN
Select Disable to turn this feature off.
LEC - Line Echo Cancellation
Line Echo
Canceller
Tail Length
Select the maximum number of milliseconds of an echo length (
16 ms,
32 ms or 48 ms)
the MAX208M2W Series can handle and eliminate the
effect. An echo is normally caused by the sound of your voice
reverberating in the telephone receiver while you talk. Select Disable
Question: How if an echo ’ s length is longer than the set value?