Cisco Systems ATA 188 Manual De Usuario

off-time controls the length of time between audible tones in milliseconds (ms) expressed as an 
integer from 0 to 0xffff sample at 8000 samples/second.

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)

Transformed Frequency = 32767 · cos (2pi·Frequency/8000)

Amplitude ranges from 0 to 32767

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 

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.

Use the following formula to calculate the scaling factor A:

A=0.5 * 10^

((k+10-(n-1)*3)/20)

In this formula, k is the desirable volume in dBm; n is the number of frequency components. The ^ 
symbol means to the order of.

If a one-frequency component of -20 dBm volume level is desirable, then:

A=0.5 * 10^

((-20+10)/20)

 = 0.16

The following settings are recommended for the US:

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)

AlertTone = "1,30467,0,5970,0,0,480,480,1920" (approximately -10 dBm)