351
Item Description
On-hook Duration for VAD
Set the silence duration for automatic
on-hook.
Upon expiration of this duration, the
system performs on-hook automatically.
By default, the silence duration for
automatic on-hook is 7,200 seconds
(that is, 2 hours).
When the signal values of two
successive sampling points are
less than the silence detection
threshold, the system considers
that the line goes into the silent
state. If the line stays in the silent
state longer than the silence
duration for automatic on-hook,
the system will automatically
disconnect the call.
Interval between On-hook
and Off-hook
Configure the interval between on-hook and off-hook.
By default, the interval between on-hook and off-hook is 500 milliseconds.
In the delay off-hook mode, the on-hook/off-hook state of FXS and FXO lines
is consistent. When an FXS line goes off-hook, the FXO line to which the FXS
line is bound goes off-hook, too. When the FXS line in the off-hook state
needs to connect the FXO line to originate a call over PSTN, the FXO line
must first perform an on-hook operation, and then perform an off-hook
operation to send the called number. This task is to set the interval between
the on-hook and off-hook operations.
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. Hewlett Packard
Enterprise 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.
Time for CID Check Configure the time for CID check. By default, CID check is
performed between the first and
the second rings, and the FXO
line goes off-hook as soon as the
check completes.
Number of Rings after CID
Check to Off-hook
Set the number of rings after the CID
check to off-hook. The greater the value,
the later the FXO line goes off-hook.
Electrical Impedance
Each country corresponds to an impedance value. Therefore, you can specify
an impedance value by specifying a country. By default, the electrical
impedance on the FXO or FXS voice subscriber line is the impedance value
corresponding to China.
Packet Loss Compensation
Mode
Specify either of the following packet loss compensation algorithms:
• Specific algorithm of the device.
• Universal frame erasure algorithm.
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.
Busy Tone Sending
• Enable.
• Disable.
With the busy-tone sending function enabled, you can set the duration of busy
tones.
Duration of Busy Tone
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
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