Multi-Tech Systems CDMA Wireless Modem manual Dtmf Signals +VTD, +VTS

Chapter 5 – Call Control Commands

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	Possible Responses
AT+VTD=4,3	OK
Note: To define 300 ms on tone duration and 200 ms off tone duration.	Note: Command valid
AT+VTD=?	+VTD: (0-5), (0-3)
Note: Display valid parameter ranges.	OK

+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	Possible Responses
AT+VTS=#	OK
	Note: Command valid
AT+VTS=11	OK
AT+VTS=4	OK

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	Possible Responses
	AT+WSDT=2	OK
		Starts DTMF tone
	AT+WSDS	OK
		Stops DTMF tone

Multi-Tech Systems, Inc. CDMA Wireless AT Commands - PN S000294C 37