Westermo GDW-11 - Manual (Page 29)

Call Control commands 29 6615-2220
+VTD, +VTS – DTMF signals
+VTD Description:
The product enables the user application to send DTMF tones over the GSM network.
This command is used to define tone duration. (the default value is 70 ms ± 5 ms,
according to 3GPP 23.014).
+VTD Syntax:
AT+VTD=<n>
+VTD Parameters:
<n> This refers to an integer <n> that defines the length of tones emitted as a result of
the +VTS command. This does not affect the D command.
Value different than zero causes a tone of duration <n>*100 milliseconds.
Value zero (default value) causes a tone duration of 70 ± 5 ms.
Note: The value is used modulo 256.
Command example Possible responses Note
AT+VTD=6 OK To define 600 ms tone
duration, Command valid
AT+VTD=0 OK To set the default value
(70-±-5 ms)
AT+VTD? +VTD:<n> Ask for current value
OK
AT+VTD=? +VTD:(0-255) Ask for range
OK
+VTS Description:
The product enables the user application to send DTMF tones over the GSM network.
This command enables tones to be transmitted. DTMF tones can only be transmitted
when there is an active call.
+VTS Syntax:
AT+VTS=<Tone>
+VTS Parameters:
<Tone> is in {0-9,*,#,A,B,C,D}.
Command example Possible responses Note
AT+VTS=A OK Command valid
AT+VTS=11 +CME ERROR: 4 If the <Tone> is wrong
AT+VTS=4 +CME ERROR: 3 If there is no communica-
tion
AT+VTS=1;+VTS=3;+VTS=# OK To send tone sequence 13#