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16–17
The DCE returns the OK result code if the DCE accepts this command, or it re-
turns the ERROR result code if the <interval> value is out of range.
• AT+VRN?
The DCE returns the current Ringback Never Appeared Timer interval value fol-
lowed by the OK result code.
• AT+VRN=?
The DCE will return the permitted interval for the Ringback Never Appeared Tim-
er. The response is:
0-255
OK
• AT+VSD=<sds>,<sdi>
This command causes the DCE to set the silence detection sensitivity and the re-
quired period of silence before the DCE can report silence detected at the end of a
voice receival either with the "Presumed End of Message" (QUIET) or "Presumed
Hang-up" (SILENCE) event reports.
<sds>: DCE silence detection threshold level; a larger value of this
subparameter implies that the DTE wants the DCE to treat noisier
conditions as silence. The actual value of this subparameter has no
physical meaning. The range of the sensitivity <sds> is from 0 to 31. A
value of zero disables the silence detection. The default value is 15.
<sdi> : The required period of silence before the DCE can report silence
detected either with the "Presumed End of Message" (QUIET) or
"Presumed Hang-up" (SILENCE) event report. A value of zero disables
the DCE silence detection. The range of the interval <sdi> is from 0 to
255 in units of 0.1 seconds. The default value is 70 (7 seconds).
The DCE returns the OK result code if the DCE accepts this command, or it re-
turns the ERROR result code if <sds> or <sdi> is out of range.
• AT+VSD?
This command causes the DCE to report current <sds> and <sdi> settings. The
form of the response is:
<sds>,<sdi>
OK
• AT+VSD=?
This command causes the DCE to report the permitted range of <sds> and
<sdi>. The response is:
(0-31),(0-255)
OK