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Configuring the comfortable noise function, Configuring echo cancellation – H3C Technologies H3C MSR 5600 User Manual

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19

Step Command

Remarks

3.

Configure the interval

between off-hook and dialing
the first digit.

timer first-dial seconds

The default is 10 seconds.
This command applies only to FXO
and FXS interfaces.

4.

Configure the maximum

interval for dialing the next
digit.

timer dial-interval seconds

The default is 10 seconds.

5.

Configure the maximum

duration for playing ringback
tones.

timer ring-back seconds

The default is 60 seconds.

6.

Configure the dial delay time. delay start-dial seconds

The default is 1 second.
This command applies to only FXO

and FXS interfaces.

7.

Configure the hookflash time
range.

timer hookflash-detect
hookflash-range

By default, the hookflash time
range is 50 to 180 milliseconds;
that is, if an on-hook condition lasts

for a period that falls within the

hookflash time range, it is
considered a hookflash.
This command applies to only FXS
interfaces.

8.

Configure the maximum
duration the terminating

device waits for the first digit.

timer wait-digit { seconds |
infinity }

The default is 5 seconds.
This command applies to only E&M
interfaces.

Configuring the comfortable noise function

You can configure this feature to generate comfortable background noise to replace the silent gaps

during a conversation.
To configure the comfortable noise function:

Step Command

Remarks

1.

Enter system view.

system-view

N/A

2.

Enter voice interface view.

subscriber-line line-number N/A

3.

Enable the comfortable noise
function.

cng-on

By default, this function is enabled.

Configuring echo cancellation

An echo is the audible leak-through of your own voice into your own receive path. When the voice of a

user leaks into the receive path, it is an echo. The echo cancellation function can alleviate the echo

problem.
The time when an echo occurs and the size of the echo are relatively fixed. As shown in

Figure 8

, there

is a voice signal at time 0, and an echo occurs after about 40 milliseconds (ms). To cancel this echo, set