NEC SP5008A - Manual (Page 48)

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Ringing Frequency Specify the Ringing frequency value.
ringing frequency : 15~100 (Unit : Hz)
Ringing ON Specify the Ringing ON value.
ringing ring ON : 0~8000 (Unit : ms)
Ringing OFF Specify the Ringing OFF value.
ringing ring OFF : 0~8000 (Unit : ms)
Ringing level Specify the ringing level.
ringing level : 0 ~ 94 (Unit : V)
Min. Digit Count Specify the minimum digit count (1~10, 0: Disable), this
feature is used to change the ringing frequency by detecting
the digit length of incoming calls’ number. When the digit
length of an incoming caller number is greater than the
specified setting, the system will use primary ringing. If the
digit is less than the specified setting, the system will use the
secondary ringing.
Country Specify the ringing standard to use.
1. Press the “Apply” button (at the bottom) after you finish to save changes.
2. Press the “Reboot” button to apply the changes.