Version 6.8 153 Mediant 2600 E-SBC
User's Manual 14. Media
14 Media
This section describes the media-related configuration.
14.1 Configuring Voice Settings
The Voice Settings page configures various voice parameters such as voice volume, and
DTMF transport type. For a detailed description of these parameters, see ''Configuration
Parameters Reference'' on page 533.
To configure the voice parameters:
1. Open the Voice Settings page (Configuration tab > VoIP menu > Media > Voice
Settings).
2. Configure the Voice parameters as required.
3. Click Submit.
4. To save the changes to flash memory, see ''Saving Configuration'' on page 424.
14.1.1 Configuring Voice Gain (Volume) Control
The device allows you to configure the level of the received (input gain) IP signal and the
level of the transmitted (output gain) IP signal. The gain can be set between -32 and 31
decibels (dB).
The following procedure describes how to configure gain control using the Web interface:
To configure gain control using the Web interface:
1. Open the Voice Settings page (Configuration tab > VoIP menu > Media > Voice
Settings).
Figure 14-1: Voice Volume Parameters in Voice Settings Page
2. Configure the following parameters:
• 'Voice Volume' (VoiceVolume) - Defines the voice gain control (in decibels) of
transmitted signal
• 'Input Gain' (InputGain) - Defines the PCM input gain control (in decibels) of the
received signal
3. Click Submit.
14.1.2 Echo Cancellation
The device supports adaptive linear (line) echo cancellation according to G.168-2002.
Echo cancellation is a mechanism that removes echo from the voice channel. Echoes are
reflections of the transmitted signal.
In this line echo, echoes are generated when two-wire telephone circuits (carrying both
transmitted and received signals on the same wire pair) are converted to a four-wire circuit.
Echoes are reflections of the transmitted signal, which result from impedance mismatch in
the hybrid (bi-directional 2-wire to 4-wire converting device).
An estimated echo signal is built by feeding the decoder output signal to an RLS-like
adaptive filter, which adapts itself to the characteristics of the echo path. The ‘estimated
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