Comtrol AT Commands - Manual (Page 183)

AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
102184B Conexant 5-7
+VTS - Send Voice Tone(s)
This command causes the modem to send DTMF digit or hookflash tones with the
duration specified by +VTD, to send DTMF digit or hookflash tones with duration
specified by this command, or to send single or dual tone frequencies with duration
specified with this command.
Syntax
+VTS=<string>
Defined Values
<string> The tone generation consists of elements in a list where each
element is separated by a comma. Each element can be:
1. A single character which the modem interprets as a
DTMF digit (0 - 9, #, *, or A-D) or hookflash (!), with a
duration given by the +VTD command.
2. A 3-element string enclosed in square brackets,
"[freq1,freq2,dur]", which the modem interprets as a
general dual tone and duration selection, or
3. A 2-element string enclosed in curly braces, "{X,dur}",
which the modem interprets as a DTMF digit (0 - 9, #, *,
or A-D), or hookflash (!) with a duration (dur) different
than that given by the +VTD command.
Missing subparameters assume the default value. Unspecified
values always default to zero for frequencies, DTMF * for
DTMF tones, and +VTD for duration. The omission of
commas (and associated subparameters) are valid.
The quantity in the square brackets consists of a 3-element list
(freq1,freq2,dur), which can be used to send single or dual
tones. The first element is the first frequency (freq1) with
range 0 or 200-3000 Hz. The second element is the second
frequency (freq2), with range 0 or 200-3000 Hz. The third
element is the duration (dur) in 0.01 second intervals with
range 0-255 (ASCII units of 10 ms). A list may contain null
elements. For example [3000] means that the DCE generates a
single tone at 3000 Hz for the default duration, [3000,3300]
means that the DCE generates a dual tone at 3000 and 3300
Hz for the default duration, and [,3300] means that the DCE
generates a single tone at 3300 Hz for the default duration.
The quantity in the curly braces consists of a 2-element list
(X,dur), which can be used to send DTMF tones or hookflash.
The first element is the DTMF tone or hookflash (!) character
(X), and the second element is the duration (dur) in 0.01
seconds. The characters are of the same set given above. A list
may contain null elements. For example, {2} means DTMF
tone "2" for the default duration, and {} means silence for the
default duration.
The modem will stop the tone generation at the point in the
string where the modem detects a parsing error, encounters an
invalid frequency range, encounters a <CR>, or encounters a
semi-colon.