Quectel UG Series

UMTS/HSPA Module Series
WCDMA UGxx AT Commands Manual
WCDMA_UGxx_AT_Commands_Manual Confidential / Released 186 / 247
These parameters will not be saved.
12.6. AT+VTS DTMF and Tone Generation
The AT+VTS command is used to send ASCII characters which causes MSC to transmit DTMF tones to a
remote subscriber. This command can only be operated in voice call.
Parameter
Example
ATD12345678900; //Dial
OK
AT+VTS DTMF and Tone Generation
Test Command
AT+VTS=?
Response
+VTS: (0-9,A-D,*,#),(0-255)
OK
Write Command
AT+VTS=<dtmfstring>[,<duration>]
Response
OK
ERROR
If error is related to ME functionality:
+CME ERROR: <err>
Maximum Response Time
Depends on the length of <dtmfstring> and <duration>.
Reference
3GPP TS 27.007
<dtmfstring> ASCII characters in the set 0...9,#,*, A, B, C, D. The string should enclose in
quotation marks ("...")
When sending multiple tones at a time, the time interval of two tones
<interval> specified by +VTD. The maximal length of the string is 31
<duration> The duration of each tone in 1/10 seconds with tolerance
Value ranges from 0 to 255 and default is 0
If the duration is less than the minimum value depend on the network, the
actual duration is depend on the network
If this parameter is omitted, <duration> is specified by +VTD
NOTE
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