– No value: infinite tone inactive time
– Others: normal tone inactive time (as many as 3 decimated digits)
Example: 4(1/.3+2.34,3/2+1.5)
This example means:
● Use the first frequency to generate a tone for 0.3 seconds
● Follow this tone with 2.34 seconds of silence
● Use a combination of the first and second frequencies to generate a tone for 2 seconds
● Follow this tone with 1.5 seconds of silence
● The cadence operates repeatedly for 4 seconds.
Tone Examples
The examples in this section demonstrate how to interpret some of the common tone patterns.
Dial Tone
DIAL, "350-18,440-18"
Dial tone is generated as a mixture of two frequency components:
350 Hz at -18 dBm and 440 Hz at -18 dBm
The expiration time is infinite, and tone active time is infinite.
Busy Tone
BUSY, "480-18,620-18;10;(.5+.5)"
Busy tone is generated as a mixture of two frequency components:
480 Hz at -18 dBm and 620 Hz at -18 dBm
The expiration time is exactly 10 seconds. It has only one cadence segment, which has tone active
0.5 second and tone inactive 0.5 second.
Prompt Tone
PROMPT, "480-16;10"
Prompt tone is generated from a single frequency component:
480 Hz at -16 dBm. The expiration time is exactly 10 seconds. It has only one cadence segment,
which has tone infinite active time.
SIT Tone
SIT_1, "985-16,1428-16,1777-16;20;(1/.380+0,2/.380+0,4/.380+0,0/0+4)"
Tone Examples
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