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16–19
• AT+VTD?
The DCE returns the current beep duration and pause interval setting followed by
the OK result code.
• AT+VTD=?
The DCE returns the permitted values for the beep duration and pause interval.
The response is:
(0-255), (0-255)
OK
• AT+VDD=<dds>,<ddi>
This command causes the DCE to set the DTMF detection threshold and the re-
quired period of continuous DTMF tone detection before the DCE can report a
DTMF event.
<dds> : The DCE uses this subparameter to select the sensitivity threshold
level of DTMF detection; a lower value of this subparameter implies
that the DTE wants the DCE to detect the DTMF tone more
sensitively. The range of the threshold <dds> is from 0 to 15. A
value of zero disables the DTMF detection. The default value is 5.
<ddi> : The required period of continuous DTMF tone detection before the
DCE can report a DTMF event. A value of zero disables the DTMF
detection. The range of the interval <ddi> is from 0 to 255 in units
of 5 ms. The default value is 8 (40 ms).
The DCE returns the OK result code if the DCE accepts this command, or it re-
turns the ERROR result code if any of the <dds> or <ddi> values is out of range.
• AT+VDD?
This command causes the DCE to report the current <dds> and <ddi> settings.
The format of the response is:
<dds>,<ddi>
OK
• AT+VDD=?
This command causes the DCE to report the permitted range of <dds> and
<ddi>. The response is:
(0-15),(0-255)
OK
• AT+VSY=<timer>
This command sets the DCE's voice recording resync timer. The range of <timer> is
from 0 to 255 in 50ms units. The default value is 0 (disable). A value of 0 disables re-
sync generation. In Voice Receival Mode, the speech coder is reset and generates a resync
symbol - <DLE><DC2> in the voice data according to this timer interval.