Voice At Commands - 3Jtech uModem Technical Document

9. Voice AT Commands

Command Function
+FLO Flow control select.
+VIP Initialize parameters.
+FCLASS Voice/data/fax selection 0,1,2.0,8
+FMI Manufacturer ID.
+FMM? Model ID
+FMR? Revision
+VRX Voice recording
+VGR Set the gain for the
received voice sample.
+VGT Set the gain for the
transmitted voice
sample.
+VLS Select a voice I/O
device.
+VRA Ring back goes away
timer
+VRN Ring back never come
timer
+VTX Voice transmit mode
+VSD Silence detection
+VSM Selection compression
method
2003/6 From 3JTech
Option Default
0,1,2 1
N/A N/A
0
N/A Omni56K
N/A ZyXEL
N/A V1.x
N/A N/A
0 0
0-255 128
0,1,2 0
0 – 255 70
0 – 255 10
NA NA
Threshold, 15,70
Period
(0-31),(0-255)
4;ZyXEL 4,9600
ADPCM; 4
Bit;(9600)
Revision 1.0
Research & Development
Description
0: NO flow control.
1: (XON/XOFF) Software flow control.
2: (RTS/CTS) Hardware flow control.
+VSD=15,70 (15*4, 7 second)
+VTD=100 (1 second)
+VRN=10 (10 second)
+VRA=70 (7 second)
+VGR=0 (Enable AGC)
+VGT=128
+FLO=1 (XON/XOFF)
+VIT=70 (7 second)
0: DATA.
1: CLASS 1 FAX.
2.0: CLASS 2.0 FAX.
8: VOICE.
Start recording.
0: Automatic gain control(AGC)
0: The DCE is on hook. Local phone
connected to Telco line.
1: The DCE is on-hook and is connected
to the local phone. The local phone is
provided with power. The modem can
record/play through the local phone set.
2: The DCE is off-hook and is connected
to the Telco line. The local phone is
provided with power. The modem can
record/play though the telephone line.
0 : turn off timer
Unit: 100 ms
0 : ring back never come
Enter voice transmission process.
(0-31): DCE silence detection threshold
0: Disable silence detection.
(0-255): The required period of silence
detection before DCE reporting event.
0: Disable silence detection.
Unit: 0.1 second
IMA 4 bit ADPCM.
Sample rate : 9600
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