Chapter 5 Parameters and Defaults
Tone Configuration Parameters
Note All tones are persistent (until the Cisco ATA changes state) except for the
Tone Parameter Syntax—Extended Formats
Two types of extended format exist for the Cisco ATA tone parameters:
•Extended Format A, page
–DialTone
–BusyTone
–RingbackTone
–CallWaitTone
–AlertTone
•Extended Format B, page
Extended Format A
Each tone is specified by 11 integers, as follows:
parametername:NumOfFreqs,Tfreq1,Tamp1,Tfreq2,Tamp2,NumOfOnOffPairs,OnTime1,
OffTime1,OnTime2,OffTime2,TotalToneTime
•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
For negative values, use the
•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 *
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
•OnTime1 and OnTime2 values are the lengths of time the tone is played for the first and second
Cisco ATA 186 and Cisco ATA 188 Analog Telephone Adaptor Administrator’s Guide for MGCP (version 3.0)
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