Specifications

Smart Machine Smart Decision
SIM900_AT Commands Manual_V1.07 83 2012.12.10
Reference
EIA/TIA-578-D
Note
3.2.40 AT+VTD Tone Duration
AT+VTD Tone Duration
Response
+VTD: (list of supported <n>s)
OK
Test Command
AT+VTD=?
Parameter
See Write Command
Response
+VTD: <n>
OK
Read Command
AT+VTD?
Parameter
See Write Command
Response
This command refers to an integer <n> that defines the length of tones
emitted as a result of the +VTS command. This does not affect the D
command.
OK
Write Command
AT+VTD=<n>
Parameter
<n> 1-255 Duration of the tone in 1/10 seconds
Reference
GSM 07.07 [13]
Note
3.2.41 AT+VTS DTMF and Tone Generation
AT+VTS DTMF and Tone Generation
Response
+VTS: (list of supported <dtmf>s),,(list of supported <duration>s)
OK
Test Command
AT+VTS=?
Parameters
See Write Command
Write Command
Generate tone
Duration is set by
+VTD
AT+VTS=<dtmf-
string>
Response
This Command allows the transmission of DTMF tones and arbitrary
tones in voice mode. These tones may be used (for example) when
announcing the start of a recording period.
Note: D is used only for dialing.
OK