H3C Technologies H3C MSR 50 - Manual (Page 755)

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Figure 750 ISDN line configuration page
Table 277 Configuration items
Item Description
Description Description of the ISDN line.
Comfortable Noise Function
Generate some comfortable background noise to replace the toneless
intervals during a conversation. If no comfortable noise is generated, the
toneless intervals will make both parties in conversation feel uncomfortable.
• Enable.
• Disable.
By default, the comfortable noise function is enabled.
Echo Cancellation Function
• Enable.
• Disable.
After enabling this function, you can set the echo duration, that is, the time that
elapses from when a user speaks to when he hears the echo. Echo Duration
Nonlinear Function of Echo
Cancellation
• Enable.
• Disable.
Input Gain on the Voice
Interface
When the voice signals on the line
attenuate to a relatively great extent,
increase the input gain value.
IMPORTANT:
Gain adjustment might lead to call
failures. H3C recommends not
adjusting the gain. If necessary, do
it with the guidance of technical
personnel.
Output Gain on the Voice
Interface
When a relatively small voice signal
power is needed on the output line,
increase the voice output gain value.
Companding Law
Configure a companding law used for quantizing signals.
• A-law, used in China, Europe, Africa, and South America.
• μ-law, used in USA.
IMPORTANT:
A BRI interface does not support this configuration item.