Dtmf Signals +Vtd, +Vts; Dtmf Start And Stop Continuous +Wsdt, +Wsds - Multitech CDMA Wireless Modem Reference Manual

DTMF Signals +VTD, +VTS

+VTD
Description: The product enables the user application to send DTMF tones over the CDMA network. This
command is used to define tone duration (the default value is 0,0). To define this duration,
the application uses: AT+VTD=<on>,<off>.
Values: <on> on tone duration
0: 95 milliseconds
1: 150 milliseconds
2: 200 milliseconds
3: 250 milliseconds
4: 300 milliseconds
5: 350 milliseconds
<off> off tone duration
0: 60 milliseconds
1: 100 milliseconds
2: 150 milliseconds
q3: 200 milliseconds
+VTD Syntax: Command syntax: AT+VTD=<on>,<off>
Command
AT+VTD=4,3
Note: To define 300 ms on tone duration and 200 ms off tone duration.
AT+VTD=?
Note: Display valid parameter ranges.
+VTS
Description: The product supports the ability of the user application to send burst DTMF tones over the
CDMA network. This command enables the transmission of burst DTMF tones. To transmit
DTMF tones (only when there is an active call), the application uses: AT+VTS=<Tone>
where <Tone> is in {0-9,*,#}.
+VTS Syntax: Command syntax: AT+VTS=<Tone>
Command
AT+VTS=#
AT+VTS=11
AT+VTS=4
Informative Example: To send tone sequence 13#, the application sends: AT+VTS=13#

DTMF START and STOP Continuous +WSDT, +WSDS

Description: Starts and stops a continuous DTMF tone while in a call state (conversation).
Values: <X>: (0-9, #,*)
Syntax: Command syntax: AT+WSDT=<X>
Command
AT+WSDT=2
AT+WSDS
Multi-Tech Systems, Inc. CDMA Wireless AT Commands - PN S000294C
Possible Responses
OK
Note: Command valid
OK
OK
Possible Responses
OK
Starts DTMF tone
OK
Stops DTMF tone
Chapter 5 – Call Control Commands
Possible Responses
OK
Note: Command valid
+VTD: (0-5), (0-3)
OK
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