AudioCodes MP-26 series, User Manual

Page: 105 / 464

User's Manual 9. Configuring VoIP Parameters
Version 4.4.0 105 MP26x/MP27x
3. Configure the parameters, as required. For a description of the parameters displayed
on this screen, see
Table 9-6 .
4. Click OK to save your settings.
Table 9-6: Voice and Fax Tab Parameters Description
Parameter Description
Gain Control
Enable Automatic Gain
Control Enables the Automatic Gain Control (AGC) mechanism. The AGC
mechanism adjusts the level of the received signal to maintain a steady
(configurable) volume level.
Automatic Gain Control
Direction Defines the AGC direction (local or remote user).
Note: This parameter appears only if the ‘Enable Automatic Gain Control’
check box is selected.
Target Energy Defines the signal energy value (in dBm) that the AGC attempts to attain.
The range is 0 to -63 dBm. The default value is -19 dBm.
Note: This parameter appears only if the ‘Enable Automatic Gain Control’
check box is selected.
Jitter Buffer
Minimum Delay Defines the initial and minimal delay of the adaptive jitter buffer
mechanism, which compensates for network problems. The value should
be set according to the expected average jitter in the network (in
milliseconds). The default is 35 msec.
Optimization Factor Defines the adaptation rate of the jitter buffer mechanism. Higher values
cause the jitter buffer to respond faster to increased network jitter. The
default is 7.
Silence Compression
Enable Silence
Compression
Enables silence compression, which reduces the network bandwidth
consumption. The default is disabled.
Enable G.711/G.726
Comfort Noise Enables the Comfort Noise generation feature. When enabled and silence
is detected, the device transmits a series of parameters called Silence
Information Descriptor (SID), which are used to reproduce the local
background noise at the remote (receiving) side.
Note: This parameter appears only if the ‘Enable Silence Compression’
check box is selected.
Echo Cancellation
Enable Echo
Cancellation Enables (default) echo cancellation (disabling echo cancellation should be
done for testing purposes only).
Fax and Modem Settings
Fax Transport Mode Selects the way fax calls are handled:

Transparent = Fax is transferred in-band (like a voice call) - can be
used if the codec is G.711

T.38 Relay = Fax is relayed to the remote side according to the
T.38 standard

Voice Band Data = Switch to G.711 via SIP messaging

Bypass = An automatic switch to AudioCodes' proprietary payload
type (102, 103).