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Step 5: In the Digit Off Time field, enter any number from 80 to 150. This is the interval at which FXO sends out
digits. The default is 100ms.
Step 6: In Busy Tone Repetition field, enter a number from 2 to 5. This is the number of times GT48 keeps
checking busy tone before it takes further action.
Step 7: In Busy Tone Parameter 1 field, enter one of the signal frequency parameters (IS is 61485). The formula
is: frequency=[65536*cos(2*PI*f/8000)] where the value of frequency is an integer and f is the actually
frequency value.
Step 8: In Busy Tone Parameter 2 field, enter another signal frequency parameter (IS is 0). The formula is:
frequency=[65536*cos(2*PI*f/8000)] where the value of frequency is an integer and f is the actually
frequency value.
Step 9: In Busy Tone On Time field, enter the time one busy tone will last. This time should be determined by the
equipment the FXO is connected to. International standard is 350ms.
Step10: In Busy Tone Off Time field, enter the time interval each busy tone is sent. This time should be
determined by the equipment the FXO is connected to. International standard is 350ms.
5.7.6 Advanced FXS Options
Step 1: Click the Advanced Config link on the left side of Figure 5-1. Then click FXS Config. The FXS Optional
screen displays, as shown in Figure 5-7f:
Figure 5-7f
Step 2: In the FXS Gain field, enter the volume increase into the PSTN. The range is 0 to-7dB. Default is -3.5dB.
Step 3: In the Hookflash Min field, enter the minimum time for an effective hookflash. Normally this number
should be bigger than 75ms.
Step 4: In the Hookflash Max field, enter the maximum time for an effective hookflash. Normally this number
should be smaller than 800ms.