Siemens M20 Terminal Technical Description page 92

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AT+VTS DTMF and tone generation (<Tone> in {0-9, *, #, A, B, C, D})
Test command Response
AT+VTS=? +VTS: (list of supported <dtmf>s, (list of supported <duration>s) OK
Note:
<duration> list is not presented.
Parameter
see set command
Set command Response
1) This command allows the transmission of DTMF tones and arbitrary tones in voice mode. These
AT+VTS=<dtmf- tones may be used (for example) when announcing the start of a recording period.
string>
Note:
2)
1) This is interpreted as a sequence of DTMF tones whose duration is set by the +VTD command.
AT+VTS=[<tone1
2) This has no function at GSM.
>,<tone2>,<durati-
3) This is interpreted as a DTMF tone whose duration is determined by <duration>.
on>]
OK
3)
If error is related to ME functionality:
AT+VTS=<dt-
+CME ERROR: <err>
mf>,<duration>
Note:
Parameter
<dtmf>
<duration>
Reference Note:
GSM 07.07 1) This command only works during active voice call.
2) In GSM the value of <duration> has no effect because the value of the tone duration is preset
and cannot be altered.
Version 8 dated 15.03.00
In GSM the value of tone duration is preset and cannot be altered. therefore the
D is used only for dialling.
the command is write only.
String of ASCII characters in the set 0-9,#,*,. Maximal length of the
string is 29. The string must be entered between double-quote
characters („„).
Example: string is 1234, then:
AT+VTS="1,2,3,4"
duration of the tone in 1/10 seconds
1-255
AT command interface
A
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