Specifications

Chapter 7 - Port Configuration Administration Manual (SIP/MGCP Version)
AT-VP504E FXS 57
4. Define the port1DspEchoCancelControl variable.
The Echo cancel control allows to cancel the echo effect
caused by signal reflections. Available values are:
•0 =OFF
•1 =ON
Setting User Gain
Variables
The user gain allows the user to modify the input and output sound
level.
Using a high user gain may cause sound saturation (the sound is
distorted). These parameters also directly affect the fax
communication quality and may even prevent a fax to be sent.
The user gain may be used to compensate if there is no available
configuration for the country in which the AT-VP504E FXS is located.
To set User gain variables:
1. Locate the port1DspUserGainGroup category.
2. Define the following variables:
Note: You can repeat the same process for each port of the
AT-VP504E FXS.
Warning: Use these settings with great care, because there are no
limits to the sound level range you can use.
Table 25: User Gain Variables
Variable Description
port1DspUserGainInputOffset User input gain offset in dB. Values
range from -255 dB to +255 dB. The
value may also be decimal (e.g. -5.5
dB).
Default Value: 0
port1DspUserGainOutputOffset User output gain offset in dB. Values
range from -255 dB to +255 dB. The
value may also be decimal (e.g. -5.5
dB).
Default Value: 0