Product specifications

420HD IP Phone with Microsoft Lync
Administrator's Manual 38 Document #: LTRT-09930
3.9 Setting Volume Levels
This section shows how to set volume levels.
3.9.1 Configuring Automatic Gain Control
This section shows how to configure Automatic Gain Control using the Web interface or the
configuration file.
 To configure automatic gain control:
 Using the Web interface:
1. Access the Voice page (Configuration tab > Voice Over IP menu > Voice).
Figure 3-16: Web Interface - Auto Gain Control
2. Configure using the table below as reference and click Submit.
 Using the configuration file:
Table 3-17: Automatic Gain Control Parameters
Parameter
Description
Enable Automatic Gain Control
[voip/audio/gain/automatic_gain_control/enabled]
Enables the AGC. AGC automatically
adjusts the phone’s voice volume to
compensate for weak or loud signals.
 [0] Disable (default)
 [1] Enable
Automatic Gain Control Direction
[voip/audio/gain/automatic_gain_control/direction]
Determines whether AGC is located
before the encoder input (CTL_LOCAL)
or after the decoder output
(CTL_REMOTE).
 [CTL_REMOTE] For Remote User
(default) - AGC is located after the
Decoder output
 [CTL_LOCAL] For Local User - AGC
is located before the Encoder input
Target Energy
[voip/audio/gain/automatic_gain_control/target_energy]
The required output energy (in dBm) of
the AGC.
The valid range is -31 to 0 (dB). The
default value is -19.