Version 3.0.1 51 July 2010
MP-20x Telephone Adapter 5. Configuring VoIP Parameters
Table 5-4: Voice and Fax Tab Parameters Description
Parameter Description
Gain Control
Enable Automatic Gain
Control
When enabled (when the box is checked), the device adjusts the voice
volume automatically to compensate for a weak or loud signal.
Automatic Gain Control
Direction
Determines whether the AGC is located before the Encoder input or after
the Decoder output.
Target Energy
The required output energy of the AGC.
Jitter Buffer
Minimum Delay
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). Default = 35
msec.
Optimization Factor
The adaptation rate of the jitter buffer mechanism. Higher values cause the
jitter buffer to respond faster to increased network jitter. Default = 7.
Silence Compression
Enable Silence
Compression
Check to enable silence compression for reducing the network bandwidth
consumption. Default = Disabled.
Enable G.711/G.726
Comfort Noise
When the Comfort Noise generation feature is 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.
Echo Cancellation
Enable Echo
Cancellation
Check to enable echo cancellation (disabling echo cancellation should be
done for testing purposes only). Default = Enabled.
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
VBD = (Voice Band Data) Switch to G.711 via SIP messaging
Bypass = An automatic switch to AudioCodes' proprietary payload type
(102, 103).
Max Rate
The maximum fax rate. Select from the drop-down list either:
2.4 Kbps, 4.8 Kbps, 7.2 Kbps, 9.6 Kbps, 12 Kbps or 14.4 Kbps (default).
Note: This parameter appears only if 'Fax Transport Mode' is “T.38 Relay”.
Max Buffer
The maximum amount of T.38 data stored on the MP-20x DSP. The valid
range is 128 to 2048. The default is 1024.
Max Datagram
The maximum total size of TCP/UDPTL packets that can be received at the
remote gateway. The valid range is 160 to 1020. The default is 320.
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