Silicon Laboratories SI2493/57/34/15/04 - Manual (Page 176)

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176 Rev. 1.3
+VRN
Ringing Tone Never Appeared Timer
This command sets the amount of time in seconds the DCE will wait looking for Ring-
ing Tone. If the DCE does not detect Ringing Tone in this time period, the DCE shall
assume that the remote station has gone off-hook and return an OK result code.
Default time is 0 seconds.
+VRX
Receive Voice Stream
Enable DTE receive of voice stream. The DCE will return a CONNECT response fol-
lowed by the voice stream as defined by the +VSM command. The DTE can issue a
or sequence to terminate the receive stream. The DCE will
return a followed by an OK response for and
followed by an OK response for . The DCE can be configured to termi-
nate the stream using the DTE/DCE Inactivity Timer, which is configured using the
+VIT command. The DTE will need to process any shielded events present in
the data stream. Any sequences can be preserved to allow less over-
head during playback of the stream with the +VTX command.
+VSD = ,
Silence Detection
Silence Detection Sensitivity
118 More sensitive: lower noise levels considered to be silence
128 Nominal level of sensitivity.
138 Less sensitive: higher noise levels considered to be silence
Silence Detection Interval
The time interval in 0.1 second units, which must contain no or little activity, before the
DCE will report (QUIET) (). Default is five seconds.
+VSM =
Compression Selection Method
Compression Mode
0 Signed linear PCM, 8-bit, 64 kbps
1 Unsigned linear PCM, 8-bit, 64 kbps
4 G.711U
-law companding PCM, 8-bit, 64 kbps
5 G.711A A-law companding PCM, 8-bit, 64 kbps
129 G.726 ADPCM, 2-bit, 16 kbps
131 G.726 ADPCM, 4-bit, 32 kbps
All compression modes use a fixed sampling rate of 8 kHz. See 10.2.8.2 of V.253 for
an explanation of the +VSM=? command results.
+VSP =
Voice Speakerphone State
Description
0 Speakerphone AEC, AES and LEC disabled. Handset FIR filter
coefficients are selected.
1
Speakerphone AEC, AES and LEC enabled. Speakerphone FIR filter
coefficients are selected. The +VLS=13 command must be used in combination with
this setting.
+VTD =
DTMF / Tone Duration Timer
This command sets the default DTMF / tone generation duration in 10 ms units for the
+VTS command. Default time is 1 second ( = 100).
Table 110. Extended AT+ Command Set (Continued)
Command Action