How To Calculate Scaling Factors; Recommended Values - Cisco ATA 188 Administrator's Manual

Optional Feature Parameters
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Note All tones are persistent (until the Cisco ATA changes state) except for the call-waiting tone and the
confirm tone. The call-waiting tone, however, repeats automatically once every 10 seconds while the
call-waiting condition exists.

How to Calculate Scaling Factors

Use the following formula to calculate the scaling factor A:
A=0.5 * 10^
In this formula, k is the desirable volume in dBm; n is the number of frequency components. The ^ means
to the order of.
Example
If a one-frequency component of -20 dBm volume level is desirable, then:
A=0.5 * 10^

Recommended Values

The following settings are recommended for the US:
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The following settings are recommended for Sweden:
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Cisco ATA 186 and Cisco ATA 188 Analog Telephone Adaptor Administrator's Guide (SCCP)
5-22
total-tone-time controls the length of time the tone is audible (0 to 0xffff). If this value is set to 0,
the tone will play until another call event stops the tone. For DialTone, BusyTone, ReorderTone, and
RingBackTone, the configurable value is the number of 10 ms (100 = 1 second) units.
For the other tones, the value is the number of samples at 8000 samples/second, where the following
information applies:
Frequency ranges from 0 to 4000 (Hz)
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Transformed Frequency = 32767 · cos (2pi·Frequency/8000)
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Amplitude ranges from 0 to 32767
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– Transformed Amplitude = A · 32767 · sin (2pi·Frequency/8000)
The scaling factor A determines the volume level of the tone. To calculate scaling factors, see the
"How to Calculate Scaling Factors" section on page
((k+10-(n-1)*3)/20)
((-20+10)/20)
= 0.16
DialTone = "2,31538,30831,3100,3885,1,0,0,1000" (approximately -10 dBm)
BusyTone = "2,30467,28959,1191,1513,0,4000,4000,0" (approximately -21 dBm)
ReorderTone = "2,30467,28959,1191,1513,0,2000,2000,0" (approximately -21 dBm)
RingBackTone = "2,30831,30467,1943,2111,0,16000,32000,0" (approximately -16 dBm)
CallWaitTone = "1,30831,0,5493,0,0,2400,2400,4800" (approximately -10 dBm)
ConfirmTone = "1,30467,0,5970,0,0,480,480,1920" (approximately -10 dBm)
DialTone = "1,30959,0,4253,0, 1, 0, 0,1500" (approximately -5 dBm)
BusyTone = "1,30959,0,2392,0, 0, 2000, 2000,0" (approximately -10 dBm)
ReorderTone = "1,30959,0,2392,0, 0, 2000, 6000,0" (approximately -10 dBm)
RingBackTone = "1,30959,0,2392,0, 0, 8000, 40000,0" (approximately -10 dBm)
Chapter 5 Parameters and Defaults
5-22.
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