User's Manual
47
February 2007
MP-202 Telephone Adapter
5. Configuring VoIP Parameters
Table
5-11: VoIP - Voice and Fax
Parameter
Description
Line 1 Voice Volume /
Line 2 Voice Volume
The voice volume of line 1 / 2 (the gain from the network towards the local
phone). Default = 0 dB.
Enable Automatic Gain
Control
When enabled (when the box is checked), the device will adjust the voice
volume automatically to compensate for a weak or loud signal.
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 will cause
the jitter buffer to respond faster to increased network jitter. Default = 7.
Enable Silence
Compression
Check to enable silence compression for reducing the network bandwidth
consumption. Default = Disabled.
Enable Echo
Cancellation
Check to enable echo cancellation (disabling echo cancellation should be
done for testing purposes only). Default = Enabled.
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).
Fax Bypass Coder
Select the codec to be used for the VBD and Bypass modes. PCMA
(default) or PCMU.
G.711 64 kbps A-Law
-OR-
G.711 64 kbps u-Law
Enable CNG Detection
Check to enable detection of the fax CNG signal (generated by the calling
fax machine at the beginning of the fax session). Default = Disabled.
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).
Error Correction Mode
Check to enable fax error correction mode (ECM). Default = Enabled.
5.1.5 Configuring
Services Parameters
¾
To configure Service parameters:
Click the tab 'Service'; the basic 'Service' parameters screen opens.