MC55 AT Command Set
16.7 AT+VTS s
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MC55_ATC_V01.05 Page 399 of 469 2/10/04
Confidential / Released
16.7 AT+VTS DTMF and tone generation
The Write command is intended to send ASCII characters or strings which cause the Mobile Switching Center
(MSC) to transmit DTMF tones to a remote subscriber. It works during active voice calls only and offers the fol-
lowing variants:
•AT+VTS=<dtmfString> allows to send a sequence of DTMF tones with a duration defined with AT+VTD.
•AT+VTS=<dtmf>[,<duration>] allows to send a single DTMF tone. In this case, the duration can be ind-
vidually determined during the call.
Syntax
Parameter Description
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 ("...").
ASCII character in the set 0...9,#,*, A, B, C, D.
Test Command
AT+VTS=?
Response(s)
+VTS: (list of supported<dtmf>s), (list of supported<duration>s)
OK
Write Command
AT+VTS=<dtmfString>
Response(s)
OK
Write Command
AT+VTS=<dtmf>[, <duration>]
Response(s)
OK
PIN ASC0 ASC1 MUX1 MUX2 MUX3
! % % % % %
Reference(s)
GSM 07.07
<dtmfString>(str)
<dtmf>(str)