Quectel UG Series

UMTS/HSPA Module Series
WCDMA UGxx AT Commands Manual
WCDMA_UGxx_AT_Commands_Manual Confidential / Released 187 / 247
<Call connect>
AT+VTS="1" //The remote can listen to DTMF tone
OK
AT+VTS="1234567890A" //Send multiple tones at a time
OK
12.7. AT+VTD Set Tone Duration
AT+VTD sets the duration of DTMF tones. This command can also set time interval of two tones when
sending multiple tones at a time.
Parameter
AT+VTD Set Tone Duration
Test Command
AT+VTD=?
Response
+VTD: (0-255),(0-255)
OK
Read Command
AT+VTD?
Response
+VTD: <duration>,<interval>
OK
Write Command
AT+VTD=<duration>[,<interval>]
Response
OK
ERROR
If error is related to ME functionality:
+CME ERROR: <err>
Maximum Response Time
300ms
Reference
3GPP TS 27.007
<duration> The duration tone in 1/10 seconds with tolerance. Value ranges from 0 to 255
and default is 1. If the duration is less than the minimum time specified by the
network, the actual duration will be network specified time.
<interval> The time interval of two tones when sending multiple tones at a time by +VTS.
Value ranges from 0 to 255 and default is 0.
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