Troubleshooting guide

Epygi Technologies Hidden Pages for Quadro Advanced Configuration
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Enable On Hook Monitoring: Enables on-hook monitoring of Caller ID signals. If selected,
the system will continuously monitor FXO lines to detect Caller ID signals that are not
preceded by a notification signal. If this checkbox is not selected, the system will detect only
Caller IDs that are transmitted after a notification signal.
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Ring Confirmation Time: Minimum length of the ringing signal (in ms) required for the
system to validate an incoming call. Ringing signals shorter than the specified time will be
ignored by the system.
Please Note: For the instructions on how to determine the correct values for FXO settings
appropriate to your CO, please see the troubleshooting guide FXO Diagnostics, which is available
under the Downloads section of Epygi Technical Support Centre at www.epygi.com
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3.6 fxoconfig.cgi
The FXO Settings page allows configuring each FXO line (see Figure 10). As opposed to the
fxocfg.cgi that contains common settings for all FXO lines, the fxoconfig.cgi allows for distinct
configuration of each FXO line.
Figure 10 FXO Settings page
To modify the settings of an FXO line, click on the link associated with the line on the FXO
Settings page. This will open the FXO Settings for the selected line containing the following
settings (see Figure 11):
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Enable FXO: Enables the corresponding FXO line.
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Wait for dialtone: Enables checking the availability of the connected PSTN line by detecting
voice activity (dial tone) on the line. If enabled, the system will proceed with placing an
outgoing PSTN call only if the required voice activity level is detected on the line. The voice
activity and the timeout to wait for it are set in the fxocfg.cgi. If disabled, the system will
send DTMFs regardless of whether or not the PSTN line is working.
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DSP Echo Cancellation: Enables the DSP echo canceller for the FXO line. The echo canceller
uses adaptive linear filtering for linear processing of the echo that can be followed by non-
linear processing depending on the residual signal level.
o Echo Tail: Maximum anticipated length of echo signals. The setting value is expressed in
samples with the sampling rate of 8000 samples/sec (8 samples = 1 ms) and is used in the
adaptive liner filter.
o Echo NLP Diff: Minimum value for the Echo NLP Diff setting, which is the difference in
echo level before and after linear processing. If the difference in echo level is greater than
the specified value, the echo signals will be further processed by the non-linear processor
to remove the residual echo signal.
o Echo NLP Shift: Number of times to shift right the residual signal to decrease the echo
signal level. This is equivalent to multiplying the specified number by 6 dB and deducting it
from the residual signal strength. Note that this setting is used only if the difference in echo
level is greater than the value specified by the Echo NLP Diff setting.
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