NEC SP5008A - Manual (Page 45)

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3.2.5 Tone Setting
Dial tone Specify the pattern of the Dial tone, you can adjust the
high frequency, low frequency, high level, low level, the
On and Off time for tone 1 and 2.
Ringback tone (FXS only) Specify the pattern of the Ringback tone, you can adjust
the high frequency, low frequency, high level, low level,
the On and Off time for tone 1 and 2.
Busy tone Specify the pattern of the Busy tone, you can adjust the
high frequency, low frequency, high level, low level, the
On and Off time for tone 1 and 2.
Call-waiting (FXS only) Specify the pattern of the call-waiting tone, you can
adjust the high frequency, low frequency, high level, low
level, the On and Off time for tone 1 and 2.
Voice-Notify (for FXS+PSTN only) Specify the pattern of the Voice-Notify, you can adjust
the high frequency, low frequency, high level, low level,
the On and Off time for tone 1 and 2.
ROH Tone (FXS only) Specify the pattern of the ROH Tone, you can adjust the
high frequency, low frequency, high level, low level, the
On and Off time for tone 1 and 2. The ROH tone is a
single high frequency tone used to warn users that their
phone is not placed on-hook (hang up) correctly.
Disconnect tone 1 Specify the pattern of the disconnect tone for disconnect
tone 1 (first set), you can adjust the high frequency, low
frequency, high level, low level, the On and Off time for
tone 1 and 2.