Appendix E: AT Commands
53
Commands
Function (*voice mode only)
#VRA=
n*
Sets “Ringback Goes Away” timer value, where
n=0–255
tenths of a second (0–25.5 seconds). Default is 70. If
n=0,
the timer is turned off, and the dialing modem sends VCON
and immediately enters Online Voice Command Mode.
#VRN=
n*
Sets “Ringback Never Came” timer, where
n=0–255 tenths
of a second (0–25.5 seconds). Default is 100. If
n=0, the
timer is turned off, and the dialing modem sends VCON
and immediately enters Online Voice Command Mode.
#VRX*
Turns on the Voice Receive Mode. Requires a #VLS
command to set the input source
#VSD=0*
Disables Voice Receive Mode silence deletion.
Provides no function other than command response
compatibility.
#VSD=1*
Enable Voice Receive Mode silence deletion. Provides no
function other than command response compatibility.
#VSK=255*
Turns on the skid spare buffer space. Any number other
than 255 returns an error.
#VSP=
n*
Turns on the silence period detection timer, where
1<
n<255 tenths of a second (0–25.5 seconds). If n=0, the
timer is turned off. Default is #VSP=55.
#VSR=7200* Selects 7200 Hz sampling rate (for ADPCM or PCM)
#VSR=11025* Selects 11.025 kHz sampling rate (for PCM only)
#VSS=
n*
Enables or disables silence detection tuner, where
n=0–3.
If
n=0 (default), silence detection is disabled. Where
1<
n<3, 1 is the least sensitive setting and 3 is the most
sensitive setting.