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Chapter 5
Parameters and Defaults
Tone Parameter Syntax—Extended Formats
Two types of extended format exist for the Cisco ATA tone parameters:
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Extended Format A
Each tone is specified by 11 integers, as follows:
parametername:NumOfFreqs,Tfreq1,Tamp1,Tfreq2,Tamp2,NumOfOnOffPairs,OnTime1,
OffTime1,OnTime2,OffTime2,TotalToneTime
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OL-4804-01
Extended Format A, page
–
DialTone
BusyTone
–
RingbackTone
–
CallWaitTone
–
AlertTone
–
Extended Format B, page
parametername is the name of the tone.
NumOfFreqs = 100 + the number of frequencies in the tone. (Therefore, NumOfFreqs = 101 for one
frequency, and 102 for two frequencies.)
Tfreq1 and Tfreq2 are the transformed frequencies of the first and second frequencies, respectively.
Their values are calculated with the following formula:
32767 * cos (2*pi*F/8000)
where F is the desired frequency in Hz. Set this value to 0 if the frequency does not exist.
The range of each value is –32768 to 32767.
For negative values, use the 16-bit 2's complement value. For example, enter –1 as 65535 or as
0xffff.
Tamp1 and Tamp2 are the transformed amplitudes of the first and second frequencies, respectively.
Their values are calculated with the following formula:
32767 * A * sin(2*pi*F/8000)
A (amplitude factor) = 0.5 * 10^((k+10-(n-1)*3)/20)
where F is the desired frequency in Hz, k is the desired volume in dBm, and n is the number of
frequencies. The ^ symbol means to the order of.
NumOfOnOffPairs is the number of on-off pairs in the cadence of the tone.
Valid values are 0, 1 and 2. Use 0 if the tone is steady.
OnTime1 and OnTime2 values are the lengths of time the tone is played for the first and second
on-off pairs of a cadence, respectively. (See
Specify each value as a number of samples with a sampling rate of 8 kHz. The range of each value
is 0 to 0xffff. For example, for a length of 0.3 seconds, set the value to 2400.
Cisco ATA 186 and Cisco ATA 188 Analog Telephone Adaptor Administrator's Guide for H.323 (version 3.0)
5-43—This format can be used for the following tone parameters:
5-44—This format can be used only for the ReorderTone parameter.
Figure 5-1
Tone Configuration Parameters
for a graphical representation.)
5-43
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