AT Command Set
MC35_ATC_01_V05.00 Page 133 of 256 15.07.2002
4.49 AT+VTD=<n> Tone duration
Test command
AT+VTD=?
This command refers to an integer <duration> that defines the length
of tones transmitted with the +VTS command.
Response
+VTD (list of supported <duration>s) OK
Parameter
See write command
Read command
AT+VTD?
Response
<duration> OK
Parameter
See write command
Write command
AT+VTD=
<duration>
Response
OK
Parameter
<duration> 1 – 255 duration of the tone in 1/10 second
Reference
GSM 07.07
Note
4.50 AT+VTS DTMF and tone generation (<Tone> in {0-9, *, #, A, B, C, D})
Test command
AT+VTS=?
Response
+VTS: (list of supported <dtmf>s)[, (list of supported <duration>s)] OK
Parameter
See write command
Write command
1.
AT+VTS=<dtmf-string>
2.
AT+VTS=<dtmf>,<duration>
Response
The Write command is intended for sending ASCII characters or
strings which cause the MSC (Mobile Switching Center) to transmit
DTMF tones to a remote subscriber. The Write can only be used dur-
ing an active voice call.
1. Allows the user to send a sequence of DTMF tones with a duration
that was defined with the AT+VTD command.
2. Allows the user to send a single DTMF tone. In this case, the dura-
tion can be indvidually determined during the call.
OK
If error is related to ME functionality:
+CME ERROR: <err>
Parameter
<dtmfstring> String of ASCII characters in the set 0-9,#,*,A, B, C, D.
Maximal length of the string is 29. The string must be
enclosed in quotation marks (””).
<dtmf> ASCII character in the set 0-9,#,*, A, B, C, D.
<duration> 1-255 duration of a tone in 1/10 second
Reference
GSM 07.07
Note
The AT+VTS command is usable before PIN1 authentication has
been done.