NEC SP5008A - Manual (Page 46)

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NOTE: If the disconnect tone only has single frequency,
please set it to low frequency. If the disconnect tone
only has single cadence, please set it to Tone 1.
Disconnect tone 2 Specify the pattern of the disconnect tone for disconnect
tone 2 (second set), you can adjust the high frequency,
low frequency, high level, low level, the On and Off time
for tone 1 and 2.
NOTE: If the disconnect tone only has single frequency,
please set it to low frequency. If the disconnect tone
only has single cadence, please set it to Tone 1.
1. Press the “Apply” button (at the bottom) after you finish to save changes.
2. Press the “Reboot” button to apply the changes.