Chapter 3: AT Commands Reference
April 15, 2008 G24-L AT Commands Reference Manual 3-175
+VTD, Tone Duration
This command handles the selection of tone duration. An integer <n> defines the length of tones
emitted as a result of the +VTS command. This command does not affect the D (dial) command.
(Refer to “D, Dial Command”, page 11.)
Any value other than zero causes a tone of duration <n> in multiples of 100 msec.
In this command, the new value is erased after power down.
Note: In GSM, the tone duration value can be modified depending on the specific network.
The following table shows the +VTD parameters.
Example
AT+VTD=?
+VTD: (0-600)
OK
AT+VTD?
+VTD: 5
OK
AT+VTD=10
OK
Command Type Syntax Response/Action Remarks
Set
+VTD=<n> OK
+CME ERROR: <err>
The Set command sets the tone
duration.
Read
+VTD? <n>
+CME ERROR: <err>
The Read command displays the
current tone duration.
Test
+VTD=? +VTD: (list of
supported <n>s)
+CME ERROR: <err>
The Test command displays the list of
supported tone durations.
Table 3-117: +VTD Parameters
<Parameter> Description
<n> Defines the length of tones emitted by the +VTS command.
0-600 Multiples of 100 msec (0 is equivalent to 1, that is, 100 msec)
The default is 5 multiples of 100 msec.
