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SIM7500_SIM7600 Series_AT Command Manual_V1.07 2017-12-25
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OK
6.15 AT+VTS DTMF and tone generation
Description
This command allows the transmission of DTMF tones and arbitrary tones which cause the Mobile
Switching Center
(MSC) to transmit tones to a remote subscriber. The command can only be used
in voice mode of operation (active voice call).
NOTE: The END event of voice call will terminate
the transmission of tones, and as an operator
option, the tone may be ceased after a pre-
determined time whether or not tone duration has been
reached.
SIM PIN References
NO 3GPP TS 27.007
Syntax
Test Command Responses
AT+VTS=? +VTS: (list of supported<dtmf>s)
OK
AT+VTS=<dtmf>
[,<duration>]
AT+VTS=<dtmf-string>
OK
ERROR
Defined values
<dtmf>
A single ASCII character in the set 0-9, *, #, A, B, C, D.
<duration>
Tone duration in 1/10 seconds, from 0 to 255. This
is interpreted as a DTMF tone of different
duration from that mandated by the AT+VTD
command, otherwise, the duration which be set the
AT+VTD command will be used for the tone (<duration> is omitted).
A sequence of ASCII character in the set 0-9, *, #, A, B, C, D, and maximal length of the string is
29. The string must be enclosed in double quotes (“”), and separated by commas between the ASCII
characters (e.g. “1,3,5,7,9,*”). Each of the tones with a duration which is set by the AT+VTD
command.
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